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Supplemental Financial Information - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Supplemental Financial Information [Abstract]    
Salaries, wages and benefits $ 172,854 $ 211,801
Maintenance 127,881 135,133
Customer maintenance reserves 96,307 87,565
Aircraft fuel 73,846 40,855
Deferred revenue 66,864 58,616
Other 116,746 108,008
Accrued liabilities $ 654,498 $ 641,978