Leases, Commitments and Contingencies - Commitments and Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating lease payments for aircraft and facility obligations
Oct - Dec 2020	$ 22,393
2021	85,599
2022	76,923
2023	69,419
2024	28,091
Thereafter	98,448
Total	380,873
Firm aircraft and spare engine commitments
Oct - Dec 2020	114,223
2021	139,003
2022	402,680
Total	655,906
Interest commitments
Oct - Dec 2020	28,777
2021	114,652
2022	99,811
2023	82,790
2024	67,376
Thereafter	147,656
Total	541,062
Principal maturities on long-term debt
Oct - Dec 2020	69,405
2021	387,309
2022	388,152
2023	397,913
2024	351,431
Thereafter	1,507,447
Total long-term debt	3,101,657	$ 3,017,523
Total commitments and obligations
Oct - Dec 2020	234,798
2021	726,563
2022	967,566
2023	550,122
2024	446,898
Thereafter	1,753,551
Total	$ 4,679,498
Percentage of variable rate notes on total long-term debt	2.40%

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Amount of interest commitment due after the fifth fiscal year following the latest fiscal year.

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Amount of interest commitment due in the fifth fiscal year following the latest fiscal year.

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Amount of interest commitment due in the fourth fiscal year following the latest fiscal year.

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Amount of interest commitment due in the third fiscal year following the latest fiscal year.

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Amount of interest commitment due in the second fiscal year following the latest fiscal year.

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Amount of interest commitment maturing in the remainder of the fiscal year following the latest fiscal year ended.

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The percentage of variable rate notes on total long-term debt.

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of contractual obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of contractual obligation to be paid in remainder of current fiscal year.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of lessee's undiscounted obligation for lease payment for operating lease.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in remainder of current fiscal year.

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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Amount of purchase arrangement to be paid in remainder of current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment.

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