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Supplemental Financial Information - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Supplemental Financial Information [Abstract]    
Salaries, wages and benefits $ 175,389 $ 211,801
Maintenance 140,947 135,133
Customer maintenance reserves 91,826 87,565
Aircraft fuel 59,689 40,855
Deferred revenue 47,577 58,616
Other 99,706 108,008
Accrued liabilities $ 615,134 $ 641,978