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LONG-TERM DEBT | 3 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
LONG-TERM DEBT | LONG-TERM DEBT Long-term debt obligations on the consolidated balance sheet (in millions):
| March 31, 2018 |  | December 31, 2017
Fixed-rate notes payable due through 2028 | $ | 877 |  |  | $ | 959 |
Variable-rate notes payable due through 2028 | 1,587 |  |  | 1,625 |
Less debt issuance costs | (15 | ) |  | (15 | )
Total debt | 2,449 |  |  | 2,569 |
Less current portion | 387 |  |  | 307 |
Long-term debt, less current portion | $ | 2,062 |  |  | $ | 2,262 |
Weighted-average fixed-interest rate | 4.2 | % |  | 4.2 | %
Weighted-average variable-interest rate | 3.3 | % |  | 2.8 | %
During the three months ended March 31, 2018 the Company made debt payments of $120 million, including the prepayment of $23 million of debt. At March 31, 2018 long-term debt principal payments for the next five years and thereafter are as follows (in millions):
| Total
Remainder of 2018 | $ | 266 |
2019 | 321 |
2020 | 439 |
2021 | 421 |
2022 | 246 |
Thereafter | 768 |
Total | $ | 2,461 |
Bank Lines of Credit The Company has three credit facilities totaling $475 million. All three facilities have variable interest rates based on LIBOR plus a specified margin. One credit facility for $250 million expires in June 2021 and is secured by aircraft. A second credit facility for $75 million expires in September 2018, with a mechanism for annual renewal, and is secured by aircraft. A third credit facility for $150 million expires in March 2022 and is secured by certain accounts receivable, spare engines, spare parts and ground service equipment. The Company has secured letters of credit against the $75 million facility, but has no plans to borrow using either of the two other facilities. All three credit facilities have a requirement to maintain a minimum unrestricted cash and marketable securities balance of $500 million. The Company was in compliance with this covenant at March 31, 2018.

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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