DEBT OBLIGATIONS

Long term obligations consisted of the following (in thousands):



	December 31,			December 31,
	2016			2015
Unsubordinated term loan	$	85,636		$	100,708
Revolving credit facility	355,000			180,000
Aircraft loans	18,085			36,950
Total long term obligations	458,721			317,658
Less: current portion	(29,306		)	(33,740		)
Total long term obligations, net	$	429,415		$	283,918

The Company executed a syndicated credit agreement ("Senior Credit Agreement") in May 2011 which includes an unsubordinated term loan and a revolving credit facility. On May 31, 2016, the Company executed an amendment to the Senior Credit Agreement (the "Sixth Credit Amendment"). The Sixth Credit Amendment extended the maturity of the term loan and revolving credit facility to May 30, 2021, increased the capacity of the Revolving credit facility by $100.0 million to $425.0 million and increased the accordion feature such that the Company can now draw up to an additional $100.0 million subject to the lenders' consent. Under the terms of the Senior Credit Agreement, the Company is required to maintain collateral coverage equal to 150% of the outstanding balances of the term loan and the maximum capacity of revolving credit facility or 175% of the outstanding balance of the term loan and the total funded revolving credit facility, whichever is less. The minimum collateral coverage which must be maintained is 50% of the outstanding balance of the term loan plus the revolving credit facility commitment which was $425.0 million. The revolving credit facility has permitted additional indebtedness of $150.0 million. Each year, through May 6, 2019, the Company may request a one year extension of the final maturity date, subject to the lenders' consent.

The balances of the unsubordinated term loan are net of debt issuance costs of $0.6 million and $0.5 million for the years ended December 31, 2016 and 2015, respectively. Under the terms of the Senior Credit Agreement, interest rates are adjusted quarterly based on the Company's earnings before interest, taxes, depreciation and amortization expenses ("EBITDA"), its outstanding debt level and prevailing LIBOR or prime rates. At the Company's current debt-to-EBITDA ratio, the LIBOR based financing for the unsubordinated term loan and revolving credit facility bear a variable interest rate of 2.77% and 2.77%, respectively. The Senior Credit Agreement provides for the issuance of letters of credit on the Company's behalf. As of December 31, 2016, the unused revolving credit facility totaled $61.5 million, net of draws of $355.0 million and outstanding letters of credit of $8.5 million.

The aircraft loans are collateralized by four aircraft, and amortize monthly with a balloon payment of approximately 20% with maturities between 2017 and early 2018. Interest rates range from 6.74% to 7.06% per annum payable monthly.

The scheduled annual principal payments on long term debt, as of December 31, 2016, for the next five years are as follows (in thousands):



	Principal Payments
2017	$	29,306
2018	18,501
2019	14,861
2020	14,861
2021	381,192
2022 and beyond	—
	$	458,721

The Senior Credit Agreement is collateralized by certain of the Company's Boeing 767 and 757 aircraft that are not collateralized under aircraft loans. The Senior Credit Agreement contains covenants including, among other things, limitations on certain additional indebtedness, guarantees of indebtedness, as well as a total debt to EBITDA ratio and a fixed charge coverage ratio. The Senior Credit Agreement stipulates events of default, including unspecified events that may have material adverse effects on the Company. If an event of default occurs, the Company may be forced to repay, renegotiate or replace the Senior Credit Agreement. The Senior Credit Agreement limits the amount of dividends the Company can pay and the amount of common stock it can repurchase to $75.0 million during any calendar year, provided the Company's total debt to EBITDA ratio is under 2.75 times, after giving effect to the dividend or repurchase.