exv99w1

Exhibit 99.1

XO Holdings’ Special Committee Responds to ACF Industries Holding’s Proposal

HERNDON, VA — Marketwire — September 28, 2009 — The special committee of the Board of Directors of XO Holdings, Inc. (OTCBB: XOHO) today announced that it has unanimously concluded that the proposal of ACF Industries Holding Corp., an affiliate of Carl C. Icahn and holder of a majority of the shares of XO Holdings’ common stock, to purchase all of the shares of XO Holdings’ common stock not currently held by ACF at a price of $0.55 per share substantially undervalues the company, and, therefore, the special committee does not support the proposal. The special committee communicated to Mr. Icahn that it would consider a proposal that recognizes the full value of the company and reflects the significant benefits that would accrue to ACF as a result of full ownership.

About XO Holdings

XO Holdings, Inc. (OTCBB: XOHO) is the holding company of XO Communications, LLC (XOC) and Nextlink Wireless, Inc. (Nextlink).

XOC is a leading provider of 21st century communications services for businesses and communications services providers, including 50 percent of the Fortune 500 and leading cable companies, carriers, content providers and mobile operators. Utilizing its unique and powerful nationwide IP network and extensive local metro networks and broadband wireless facilities, XOC offers customers a broad range of managed voice, data and IP services in 75 metropolitan markets across the United States. For more information, visit www.xo.com.

Nextlink, whose services going forward have been integrated into XOC’s Carrier Services business unit, has historically provided alternative access, backhaul and diverse network solutions and services for the carrier, business and government markets. As one of the nation’s largest holders of fixed wireless spectrum, Nextlink delivers high-quality, carrier-grade broadband wireless solutions that scale to meet the demands of today’s converged world of communications – supporting next-generation mobile and wireline voice, data and video applications. For more information, visit www.nextlink.com.

XO, XOptions, XOptions Flex and all related marks are either registered trademarks or trademarks of XO Communications in the United States and/or other countries. Nextlink is a registered trademark of Nextlink Wireless, Inc. in the United States and/or other countries.

Cautionary Language Concerning Forward-Looking Statements

The statements contained in this release that are not historical facts are “forward-looking statements” (as such term is defined in the Private Securities Litigation Reform Act of 1995, as amended) that involve risks and uncertainties. These statements include those describing our ability to remain an industry leader, enhance our communications solutions, broaden our customer reach, grow our revenues, expand our market share, continue to deliver a broad range of high-capacity network services and mid-band Ethernet services, pursue growth opportunities, meet the growing demand for high-speed Internet access services, scale to multi-terabit capable router nodes and obtain future long-term financing. Management cautions the reader that these forward-looking statements are only predictions and are subject to a number of both known and unknown risks and uncertainties, and actual results, performance, and/or achievements of Nextlink and XOC may differ materially from the future results, performance, and/or achievements expressed or implied by these forward-looking statements as a result of a number of factors. These factors include, without limitation, our ability to generate sufficient capital or to obtain additional financing on