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EXHIBIT 99.1

CONTACT:

Tom Steinbauer
Senior Vice President of Finance, Chief Financial Officer
Ameristar Casinos, Inc.
(702) 567-7000

AMERISTAR CASINOS REPORTS FIRST QUARTER 2006 FINANCIAL RESULTS

Las Vegas, Nevada, May 4, 2006–Ameristar Casinos, Inc. (Nasdaq-NMS: ASCA) today announced 2006 first quarter financial results.

Highlights

	•		Record first quarter consolidated net revenues of $256.1 million, representing an increase of $16.0 million, or 6.7%, over the first quarter of 2005.

	•		First quarter consolidated operating income of $43.7 million, a decrease of $2.6 million, or 5.7%, from the prior-year first quarter, after giving effect to $2.1 million of stock option compensation expense in the 2006 first quarter, as described in the following paragraph.

	•		First quarter consolidated EBITDA (a non-GAAP financial measure that is defined and reconciled with operating income below) of $66.2 million, representing a decrease of $0.9 million, or 1.3%, from the first quarter of 2005. 2006 first quarter operating income and EBITDA give effect to $2.1 million of stock option compensation expense resulting from the adoption on January 1,

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			2006 of Financial Accounting Standards Board Statement No. 123(R) (“FAS 123(R)”), which requires the recognition of compensation expense in an amount equal to the fair value of share-based payments (e.g., stock options) granted to employees. 2005 operating income and EBITDA do not include this expense.

	•		Adjusted to exclude the loss on early retirement of our senior subordinated notes described below, first quarter consolidated net income was $19.7 million (adjusted net income is a non-GAAP financial measure that is reconciled to reported net income below), an increase of $0.5 million, or 2.4%, compared to the first quarter of 2005. Consolidated reported net income for the quarter ended March 31, 2006 was adversely impacted by a one-time $17.1 million after-tax loss on early retirement of all $380.0 million aggregate principal amount of our 10.75% senior subordinated notes due 2009, which we redeemed on February 15, 2006 using borrowings under our $800.0 million revolving loan facility. The revolving loan facility bears interest at variable rates that are currently substantially lower than the 10.75% fixed rate on the senior subordinated notes, and we expect that the redemption will result in significant savings in future interest expense. The redemption of the senior subordinated notes resulted in $1.3 million in after-tax savings on interest expense during the first quarter of 2006.

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	•		Adjusted to exclude the loss on early retirement of our senior subordinated notes, first quarter diluted earnings per share were $0.35 (adjusted diluted earnings per share is a non-GAAP financial measure that is reconciled to reported diluted earnings per share below), compared to $0.34 for the first quarter of 2005. The adoption of FAS 123(R) negatively impacted diluted earnings per share in the first quarter of 2006 by $0.02. Analysts’ latest consensus estimate for the first quarter of 2006, as reported by Thomson First Call, was $0.37, before the impact of the loss on early retirement of the senior subordinated notes, which adversely impacted reported diluted earnings per share by $0.30. Our reported diluted earnings per share for the first quarter of 2006 were $0.05. Our previously issued earnings guidance for the first quarter of 2006 indicated a range of diluted earnings per share, on a GAAP basis, of $0.08 to $0.10. All share and per-share information in this press release has been adjusted as necessary to give effect to our 2-for-1 stock split effective June 6, 2005.

	•		On April 1, 2006, we rebranded our newly renovated and expanded casino in Black Hawk, Colorado. Ameristar Black Hawk, formerly known as Mountain High Casino, now features an expanded parking garage with 1,550 parking spaces, refurbished and rebranded dining venues, additional gaming space, 1,600 slot machines and an upscale Star Club for our top players. Additionally, we announced the details of the 33-story, 536-room Four Diamond-quality hotel that we plan to begin constructing this quarter.

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	•		We were the leader in market share (based on gross gaming revenues) for the first quarter of 2006 in all our markets, with the exception of our Black Hawk property, which was undergoing the renovation and expansion project throughout the first quarter.

	•		On February 15, 2006, our Board of Directors declared a quarterly cash dividend of $0.09375 per share, which was paid to stockholders of record as of March 1, 2006. This amount represents a 20% increase in the dividend rate over 2005.

Craig H. Neilsen, Chairman and CEO, stated: “In the first quarter of 2006, we completed the initial phase of our expansion activity at our Black Hawk property. We nearly doubled the parking garage’s capacity, the first and second floor gaming areas and non-gaming venues have been remodeled and we have added a second floor casino area that now features 650 slot machines. On April 1, 2006, we rebranded the property as Ameristar Black Hawk, and the increase in business volumes we have experienced since the rebranding indicates that we are on the way for the property to gain a solid presence in the greater Denver market similar to our achievements in our other markets.

We faced a number of competitive challenges in the first quarter of 2006 that adversely impacted our financial results. The heightened competition in our Missouri markets resulted in increased promotional spending and lower operating margins. In response to the ongoing competitive pressures, we are currently implementing several cost-containment initiatives that we believe will effectively modify our cost structure and create operating efficiencies with the goal of maintaining our leadership in operating

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margin and market share in these jurisdictions. Our proven business model has historically resulted in high operating margins and market share leadership, and with the help of these initiatives and our previously announced capital improvement projects (see “Capital Projects” below), we believe we will be able to achieve similar results.

In Council Bluffs, the competitive pressure from the recently completed expansion and rebranding of our land-based competitor has also resulted in declines in operating margin and market share. Although we are slightly above the market share level we had prior to the competitor’s construction disruption, we do not anticipate achieving market share levels reached while construction was in progress. Once the market environment stabilizes, we will complete a thorough evaluation of our cost structure in Council Bluffs along with an in-depth analysis of our marketing and advertising costs in order to maximize operating margin and market share.

In Vicksburg, our first quarter financial performance was significantly improved over the prior-year first quarter due to the increased business volumes following Hurricane Katrina. However, we are seeing a quicker than expected lessening of these increased business volumes as gaming capacity continues to be restored on the Mississippi Gulf Coast.

As for external development, we continue to seriously consider new jurisdictions, acquisitions and other opportunities to broaden our earnings base and diversify the geographic profile of our Company. Our ongoing commitment to internal and external expansion provides us the opportunity to continue to build shareholder value.”

Financial Results

Net Revenues

Consolidated net revenues for the first quarter of 2006 were $256.1 million, an increase of 6.7% compared to the first quarter of 2005. All of our properties improved in net revenues, with increases of 23.4% at Ameristar Vicksburg, 8.9% at the Jackpot

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Properties, 5.1% at Ameristar Kansas City, 3.9% at Ameristar Council Bluffs, 3.6% at Ameristar St. Charles and 1.1% at Ameristar Black Hawk. The improved financial performance of our Vicksburg property continues to be primarily attributable to the increase in business volume following the closure of the Gulf Coast casinos as a result of Hurricane Katrina. However, this increase in the property’s business volume diminished significantly from the fourth quarter of 2005 following the reopening of three Mississippi Gulf Coast casinos in December 2005, and we expect it to diminish further as more Gulf Coast casinos reopen.

For the quarter, Ameristar Kansas City and Ameristar St. Charles increased market share by 0.9 and 0.1 percentage point to 36.7% and 31.7%, respectively, over the prior-year first quarter. Ameristar Council Bluffs and Ameristar Vicksburg continued their long-time market leadership positions, despite decreases of 0.5 and 0.2 percentage point to 42.1% and 45.6%, respectively, from the first quarter of 2005. Our Council Bluffs property’s market share was adversely impacted by the completion in March 2006 of a major expansion and rebranding by a competing land-based casino. We anticipate the increased competition from the land-based casino will have an ongoing negative impact on our market share in Council Bluffs.

Consolidated casino revenues for the first quarter of 2006 increased $19.8 million over the 2005 first quarter, principally due to a $20.1 million (9.5%) increase in slot revenues. We believe the growth in slot revenues at all our properties has been driven by our continued slot product enhancements and our successful slot mix strategy. We further believe casino revenues increased in part as a result of the continued successful

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implementation of our targeted marketing programs, as evidenced by a 10.6% increase in rated play at our properties from the first quarter of 2005. For the quarter ended March 31, 2006, promotional allowances increased $10.0 million, or 22.9%, over the prior-year first quarter due in part to the rise in rated play and the increasingly competitive environment in our Missouri and Iowa markets.

Operating Income and EBITDA

In the first quarter of 2006, consolidated operating income decreased $2.6 million, or 5.7%, to $43.7 million compared to the first quarter of 2005. Consolidated operating income margin decreased 2.2 percentage points from the prior-year first quarter to 17.0%. Consolidated EBITDA decreased 1.3% to $66.2 million and the related margin decreased 2.0 percentage points to 25.9% compared to the first quarter of 2005. The decline in operating income, EBITDA and the related margins from the prior-year first quarter was mostly attributable to the increased competitive pressures experienced by our Missouri and Iowa properties and greater than expected construction disruption at Ameristar Black Hawk. The financial performance of these properties was somewhat offset by Ameristar Vicksburg’s strong first quarter 2006 results, namely a 34.9% increase in operating income and a 27.7% increase in EBITDA.

Consolidated operating income and EBITDA were also affected by the stock option compensation expense we were required to recognize in the first quarter of 2006 as described above. Additionally, depreciation and amortization expense increased $1.8 million (8.4%) over the first quarter of 2005, primarily due to $0.8 million in

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depreciation expense from capital improvements placed in service over the last six months at Ameristar Black Hawk. The rate of growth in health benefit costs moderated significantly in the first quarter of 2006, as compared to the trend of the last several quarters.

During the first quarter of 2006, Ameristar Vicksburg increased operating income $3.2 million over the first quarter of 2005, to $12.5 million. EBITDA improved by $3.4 million over the prior-year quarter. We expect the property’s quarterly financial performance to be better than in 2005 through the third quarter. However, as previously mentioned, we anticipate the increase in the property’s business volume to diminish further as the Gulf Coast casinos continue to reopen.

At Ameristar St. Charles, increased revenues and a reduction in workers’ compensation expense were mostly offset by increased costs associated with marketing and promotional activities. As a result, operating income and EBITDA were relatively flat compared to the prior-year first quarter. Ameristar St. Charles’ 2006 first quarter operating income and EBITDA margins decreased by 1.1 and 1.2 percentage points, respectively, from the first quarter of 2005.

Ameristar Kansas City’s 2006 first quarter operating income decreased $1.5 million, or 10.7%, and EBITDA decreased $1.2 million, or 6.0%, compared to the corresponding prior-year period. The related operating income and EBITDA margins declined 3.5 and 3.3 percentage points, respectively, over the first quarter of 2005, due in part to increased marketing, advertising and entertainment costs.

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First quarter operating income at Ameristar Council Bluffs declined by $0.6 million, or 4.1%, and EBITDA declined by $0.3 million, or 1.6%, compared to the prior-year first quarter. The property also experienced decreases in its operating income margin and EBITDA margin of 2.2 and 1.8 percentage points, respectively. As previously noted, this property’s first quarter financial performance was adversely impacted by the completion of the competing land-based casino’s rebranding and expansion.

For the quarter ended March 31, 2006, our Black Hawk property’s operating income decreased $2.5 million, or 109.6%, and EBITDA decreased $1.7 million, or 46.1%, compared to the prior-year first quarter. Significant construction disruption due to the recently completed casino expansion project materially affected this property’s operating results during the first quarter. During the quarter ended March 31, 2006, our Black Hawk property also incurred $0.4 million in costs related to its rebranding as Ameristar Black Hawk that occurred on April 1, 2006. The rebranding costs are non-recurring in nature and are expected to total approximately $1.7 million over the first and second quarters of 2006.

During the first quarter of 2006, corporate expense increased $1.3 million, or 10.6%, compared to the first three months of 2005. The increase resulted primarily from the recognition in the 2006 period of $1.4 million of stock option compensation expense at the corporate level related to the adoption of FAS 123(R) (the remaining $0.7 million of this expense was recognized at our various properties), which was partially offset by a reduction in development-related costs.

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Net Income and Diluted Earnings Per Share

Reported net income decreased 86.4%, from $19.2 million in the first quarter of 2005 to $2.6 million for the first three months of 2006. Reported diluted earnings per share were $0.05 in the quarter ended March 31, 2006, compared to $0.34 in the corresponding prior-year quarter. The one-time charge relating to the loss on redemption of our senior subordinated notes adversely impacted reported diluted earnings per share by $0.30. Additionally, diluted earnings per share for the first quarter of 2006 were negatively impacted by $0.02 by the adoption of FAS 123(R). Interest expense for the 2006 first quarter was $13.5 million, down $1.7 million from the first quarter of 2005. The decrease was due primarily to a reduced average interest rate resulting from the November 2005 refinancing of our senior secured credit facility and the February 2006 redemption of our senior subordinated notes with borrowings under the new credit facility at a substantially lower interest rate.

Our effective income tax rate increased from 36.9% for the quarter ended March 31, 2005 to 43.0% for the quarter ended March 31, 2006, due primarily to a change in our recorded tax reserves.

Liquidity and Capital Resources

Our financial position remains strong, with approximately $107.9 million of cash and cash equivalents and $369.6 million of available borrowing capacity under our $800.0 million revolving loan facility as of March 31, 2006. Upon satisfaction of certain conditions, we will also have the option to increase the total amount available under the credit facility by up to an additional $400.0 million. During the first quarter of 2006, our

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long-term debt increased by approximately $45.8 million, due primarily to $425.0 million in borrowings under our revolving loan facility, of which $420.9 million were used to redeem the senior subordinated notes at a redemption price of 105.375% of the principal amount plus $20.4 million in accrued and unpaid interest at the redemption date.

Capital expenditures for the 2006 first quarter totaled $56.4 million. These expenditures were mostly funded with cash from operations and, to a lesser extent, with the proceeds of a senior term loan under our new credit facility that was drawn in the fourth quarter of 2005. Capital expenditures during the first quarter included $17.8 million for capital improvement projects at Ameristar Black Hawk, $13.6 million for the acquisition of slot machines, $12.1 million related to our expansion activities at Ameristar St. Charles described below and $8.9 million for the construction of a new parking garage at Ameristar Vicksburg. Capitalized interest for the quarter ended March 31, 2006 totaled $1.6 million.

Capital Projects

At Ameristar St. Charles, we have commenced the construction of a 400-room, all-suite hotel, an indoor/outdoor swimming pool, a 7,000 square-foot full-service spa, 20,000 square feet of new meeting and conference facilities and an additional 2,000-space parking garage. The total cost of these projects is expected to be approximately $240 million, with the completion dates projected to be the second quarter of 2006 for the conference facilities, the fourth quarter of 2006 for the initial 1,400 spaces of the parking garage and the fourth quarter of 2007 for the hotel and the remainder of the garage. We believe these planned improvements will allow us to further enhance our competitive advantage in the St. Louis market, which should position us to extend our market share leadership. We expect minimal construction disruption to existing operations as these capital improvement projects are being completed.

At Ameristar Vicksburg, we have commenced the first phase of our master expansion plan with the construction of a new 1,100-space parking garage, which is expected to be completed in the second quarter of 2007. In June 2006, we intend to commence an expansion of the casino vessel that will directly connect to the new parking garage. The expanded casino will allow for the addition of up to 800 slot machines. The expansion project will also include the addition of two new restaurants, a new Star Club for our VIP guests, a poker room, a retail shop and other amenities. This project is slated for a mid-year 2007 completion. The expected cost of our planned capital improvements at Ameristar Vicksburg is approximately $90 million. These improvements will help alleviate long-standing capacity constraints in parking and gaming positions, which we believe will allow us to increase our market dominance in Vicksburg.

In addition to these internal capital expenditure projects, we will continue to explore opportunities in new jurisdictions and potential growth from acquisitions. We will continue to aggressively pursue external expansion opportunities in an attempt to further diversify our assets and increase shareholder value.

Outlook

Based on our preliminary results of operations in April 2006 and our outlook for the remainder of the quarter, we currently estimate operating income of $33 million to $35 million, EBITDA of $57 million to $59 million (given anticipated depreciation expense of $24 million), interest expense of $12 million and diluted earnings per share of $0.23 to $0.25 for the second quarter of 2006.

We are revising our financial guidance for the full year 2006. We currently estimate operating income of $154 million to $160 million (decreased from prior

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guidance of $166 million to $174 million), EBITDA of $248 million to $254 million (decreased from prior guidance of $263 million to $271 million) and diluted earnings per share of $0.86 to $0.92 (decreased from prior guidance of $0.98 to $1.06). We currently anticipate $94 million of depreciation expense, $49 million of interest expense and $9 million of stock option compensation expense for the full year 2006.

Our revised financial guidance for the full year 2006 primarily reflects quicker than expected lessening of increased business volumes at Ameristar Vicksburg (i.e., increases that resulted post-Hurricane Katrina) due to capacity being added at Mississippi Gulf Coast casinos faster than we originally anticipated and the higher-than-anticipated business levels at the reopened casinos. The declining business volumes at our Vicksburg property resulted in a reduction of our previously issued annual operating income and EBITDA guidance of $11 million, of which $4 million related to the first quarter of 2006 and $7 million relates to the remaining three quarters of 2006. To a lesser extent, our revised guidance reflects the increased competition in Council Bluffs due to the recent completion of our competitor’s major expansion, the effect of which is somewhat greater than we originally expected.

The above estimates of operating income, EBITDA and diluted earnings per share give effect to the impact of FAS 123(R), which we anticipate will result in additional after-tax expense of $1.3 million for the second quarter of 2006 and $5.7 million for the full year 2006 and adversely impact diluted earnings per share by $0.02 and $0.10 for the second quarter and full year 2006, respectively.

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Gaming regulatory authorities in Colorado, Iowa, Mississippi and Missouri currently publish, on a monthly basis, gross gaming revenue, market share and other financial information with respect to the gaming facilities, including Ameristar’s, that operate within their respective jurisdictions. Because various factors in addition to our gross gaming revenue (including changes in operating costs, promotional allowances and other expenses) influence our operating income, EBITDA and diluted earnings per share, such reported information, as it relates to Ameristar, may not be indicative of the results of our operations for such periods or for future periods.

Conference Call

We will hold a conference call to discuss our first quarter results and guidance for the second quarter at 5:30 p.m. Eastern Time on May 4, 2006. The call can be accessed live by calling (866) 550-6338. It can be replayed until May 12, 2006 at 3:00 a.m. Eastern Time by calling (888) 203-1112 and using the access code number 4927460. Interested parties wanting to listen to the live conference call on the Internet may do so on our web site – www.ameristar.com – in “About Ameristar/Investor Relations” under the “Quarterly Results Conference Calls” section.

Forward-Looking Information

This press release contains certain forward-looking information that generally can be identified by the context of the statement or the use of forward-looking terminology, such as “believes,” “estimates,” “anticipates,” “intends,” “expects,” “plans,” “is confident that” or words of similar meaning, with reference to Ameristar or our management. Similarly, statements that describe our future plans, objectives, strategies, financial

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results or position, operational expectations or goals are forward-looking statements. It is possible that our expectations may not be met due to various factors, many of which are beyond our control, and we therefore cannot give any assurance that such expectations will prove to be correct. For a discussion of relevant factors, risks and uncertainties that could materially affect our future results, attention is directed to “Item 1A. Risk Factors” and “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Annual Report on Form 10-K for the year ended December 31, 2005.

About Ameristar

Ameristar Casinos, Inc. is a leading Las Vegas-based gaming and entertainment company known for its premier properties characterized by innovative architecture, state-of-the-art casino floors and superior dining, lodging and entertainment offerings. Ameristar’s focus on the total entertainment experience and the highest quality guest service has earned it a leading market share position in each of the markets in which it operates. Founded in 1954 in Jackpot, Nevada, Ameristar has been a public company since November 1993. The company has a portfolio of seven casinos in six markets: Ameristar St. Charles (greater St. Louis); Ameristar Kansas City; Ameristar Council Bluffs (Omaha, Nebraska and southwestern Iowa); Ameristar Vicksburg (Jackson, Mississippi and Monroe, Louisiana); Ameristar Black Hawk (Denver metropolitan area); and Cactus Petes and the Horseshu in Jackpot, Nevada (Idaho and the Pacific Northwest).

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AMERISTAR CASINOS, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
(Amounts in Thousands, Except Per Share Data)
(Unaudited)


	Three Months Ended
	March 31,
	2006			2005
REVENUES:
Casino	$	262,212		$	242,368
Food and beverage		34,224			30,287
Rooms		6,635			5,733
Other		6,941			5,590

		310,012			283,978
Less: Promotional allowances		53,918			43,869

Net revenues		256,094			240,109

OPERATING EXPENSES:
Casino		115,099			105,523
Food and beverage		17,068			15,757
Rooms		1,753			1,499
Other		4,558			3,792
Selling, general and administrative		51,294			46,244
Depreciation and amortization		22,572			20,818
Impairment loss on assets held for sale		93			193

Total operating expenses		212,437			193,826

Income from operations		43,657			46,283

OTHER INCOME (EXPENSE):
Interest income		620			119
Interest expense, net		(13,540	)		(15,261	)
Loss on early retirement of debt		(26,264	)		—
Net gain (loss) on disposition of assets		116			(687	)


INCOME BEFORE INCOME TAX PROVISION		4,589			30,454
Income tax provision		1,971			11,224

NET INCOME	$	2,618		$	19,230


EARNINGS PER SHARE:
Basic	$	0.05		$	0.35

Diluted	$	0.05		$	0.34


CASH DIVIDENDS DECLARED PER SHARE	$	0.09		$	0.08


WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic		56,063			55,234

Diluted		57,125			56,904

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AMERISTAR CASINOS, INC. AND SUBSIDIARIES
SUMMARY CONSOLIDATED FINANCIAL DATA
(Dollars in Thousands)
(Unaudited)


	Three Months
	Ended March 31,
	2006			2005
Consolidated cash flow information
Net cash provided by operating activities	$	33,538		$	49,922
Net cash used in investing activities		(52,897	)		(33,566	)
Net cash provided by/(used in) financing activities		21,077			(1,944	)

Net revenues
Ameristar St. Charles	$	75,233		$	72,644
Ameristar Kansas City		65,709			62,523
Ameristar Council Bluffs		48,160			46,363
Ameristar Vicksburg		36,759			29,797
Jackpot Properties		15,821			14,533
Ameristar Black Hawk		14,412			14,249

Consolidated net revenues	$	256,094		$	240,109


Operating income (loss)
Ameristar St. Charles	$	17,417		$	17,592
Ameristar Kansas City		12,868			14,414
Ameristar Council Bluffs		12,815			13,366
Ameristar Vicksburg		12,512			9,278
Jackpot Properties		2,569			2,332
Ameristar Black Hawk		(218	)		2,274
Corporate and other		(14,306	)		(12,973	)

Consolidated operating income	$	43,657		$	46,283


EBITDA (1)
Ameristar St. Charles	$	24,015		$	24,060
Ameristar Kansas City		18,426			19,594
Ameristar Council Bluffs		16,034			16,292
Ameristar Vicksburg		15,583			12,202
Jackpot Properties		3,655			3,488
Ameristar Black Hawk		1,965			3,645
Corporate and other		(13,449	)		(12,180	)

Consolidated EBITDA	$	66,229		$	67,101

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AMERISTAR CASINOS, INC. AND SUBSIDIARIES
SUMMARY CONSOLIDATED FINANCIAL DATA – CONTINUED
(Dollars in Thousands)
(Unaudited)


	Three Months
	Ended March 31,
	2006			2005
Operating income margins (2)
Ameristar St. Charles		23.2	%		24.2	%
Ameristar Kansas City		19.6	%		23.1	%
Ameristar Council Bluffs		26.6	%		28.8	%
Ameristar Vicksburg		34.0	%		31.1	%
Jackpot Properties		16.2	%		16.0	%
Ameristar Black Hawk		(1.5	%)		16.0	%
Consolidated operating income margin		17.0	%		19.3	%

EBITDA margins (1)
Ameristar St. Charles		31.9	%		33.1	%
Ameristar Kansas City		28.0	%		31.3	%
Ameristar Council Bluffs		33.3	%		35.1	%
Ameristar Vicksburg		42.4	%		41.0	%
Jackpot Properties		23.1	%		24.0	%
Ameristar Black Hawk		13.6	%		25.6	%
Consolidated EBITDA margin		25.9	%		27.9	%


(1)		EBITDA is earnings before interest, taxes, depreciation and amortization. EBITDA is presented solely as a supplemental disclosure because management believes that it is a widely used measure of operating performance in the gaming industry and a principal basis for the valuation of gaming companies. Our credit agreement also requires the use of EBITDA as a measure of compliance with our principal debt covenants. In addition, management uses property-level EBITDA (EBITDA before corporate expense) as the primary measure of our operating properties’ performance, including the evaluation of operating personnel. EBITDA margin is EBITDA as a percentage of net revenues. EBITDA should not be construed as an alternative to income from operations (as determined in accordance with GAAP) as an indicator of our operating performance, as an alternative to cash flows from operating activities (as determined in accordance with GAAP) as a measure of liquidity, or as an alternative to any other measure determined in accordance with GAAP. We have significant uses of cash flows, including capital expenditures, interest payments, taxes and debt principal repayments, which are not reflected in EBITDA. It should also be noted that not all gaming companies that report EBITDA calculate EBITDA in the same manner as we do.

(2)		Operating income margin is operating income (loss) as a percentage of net revenues.

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RECONCILIATION OF OPERATING INCOME (LOSS) TO EBITDA
(Dollars in Thousands)
(Unaudited)

The following table sets forth a reconciliation of operating income (loss), a GAAP financial measure, to EBITDA, a non-GAAP financial measure.


	Three Months
	Ended March 31,
	2006			2005
Ameristar St. Charles:
Operating income	$	17,417		$	17,592
Depreciation and amortization		6,598			6,468

EBITDA	$	24,015		$	24,060


Ameristar Kansas City:
Operating income	$	12,868		$	14,414
Depreciation and amortization		5,558			5,180

EBITDA	$	18,426		$	19,594


Ameristar Council Bluffs:
Operating income	$	12,815		$	13,366
Depreciation and amortization		3,219			2,926

EBITDA	$	16,034		$	16,292


Ameristar Vicksburg:
Operating income	$	12,512		$	9,278
Depreciation and amortization		3,071			2,924

EBITDA	$	15,583		$	12,202


Jackpot Properties:
Operating income	$	2,569		$	2,332
Depreciation and amortization		1,086			1,156

EBITDA	$	3,655		$	3,488


Ameristar Black Hawk:
Operating (loss) income	$	(218	)	$	2,274
Depreciation and amortization		2,183			1,371

EBITDA	$	1,965		$	3,645


Corporate and other:
Operating loss	$	(14,306	)	$	(12,973	)
Depreciation and amortization		857			793

EBITDA	$	(13,449	)	$	(12,180	)


Consolidated:
Operating income	$	43,657		$	46,283
Depreciation and amortization		22,572			20,818

EBITDA	$	66,229		$	67,101

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RECONCILIATION OF REPORTED NET INCOME AND DILUTED EARNINGS PER SHARE
TO ADJUSTED NET INCOME AND ADJUSTED DILUTED EARNINGS PER SHARE
(Dollars in Thousands, Except Per Share Data)
(Unaudited)

The following table sets forth a reconciliation of reported net income and diluted earnings per share to adjusted net income and adjusted diluted earnings per share, which are non-GAAP financial measures.


	Three Months
	Ended March 31,
	2006		2005
Adjusted Net Income (1):

Net income	$	2,618	$	19,230
Loss on early retirement of debt, net of tax of $9,192		17,072		—

Adjusted net income	$	19,690	$	19,230


Adjusted Diluted Earnings Per Share (1):

Diluted earnings per share	$	0.05	$	0.34
Loss on early retirement of debt, net of tax of $9,192		0.30		—

Adjusted diluted earnings per share	$	0.35	$	0.34


(1)		Adjusted net income and adjusted diluted earnings per share exclude the loss on early retirement of our senior subordinated notes. The adjusted amounts are presented solely as supplemental disclosures because management believes that they are widely used measures of operating performance in the gaming industry and we consider these to be better measures on which to base expectations of our future results than reported net income and diluted earnings per share. It should be noted that not all gaming companies that report adjusted net income and adjusted diluted earnings per share calculate these amounts in the same manner as we do.

###


Nevada	000-22494	880304799

(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)


3773 Howard Hughes Parkway, Suite 490S, Las Vegas, Nevada		89109

(Address of principal executive offices)		(Zip Code)


	Item 2.02. Results of Operations and Financial Condition.
	Item 9.01. Financial Statements and Exhibits.
SIGNATURES
Exhibit Index
Exhibit 99.1


Exhibit		Description
99.1		May 4, 2006 Press Release of the Registrant announcing financial results for the first quarter of 2006.


	Ameristar Casinos, Inc.
May 4, 2006	By:	/s/ Peter C. Walsh
		Name:	Peter C. Walsh
		Title:	Senior Vice President and General Counsel

Table of Contents

Table of Contents

Table of Contents

Table of Contents


Date of Report (Date of Earliest Event Reported):		May 4, 2006


Registrant’s telephone number, including area code:		(702) 567-7000


Exhibit No.		Description
99.1		May 4, 2006 Press Release of the Registrant announcing financial results for the first quarter of 2006.