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Restructuring (Tables)
 12 Months Ended
Dec. 31, 2021
Restructuring and Related Activities [Abstract]  
Schedule of restructuring charges by category During 2020, we implemented enhanced measures focusing on the safety of our customers and employees, while at the same time seeking to mitigate the impact on our financial position and operations and to position our business for recovery through actions including fleet retirements, offering voluntary retirement and separation programs and other decisions. These actions resulted in significant restructuring charges during 2020 which are summarized as follows:
Restructuring charges by category
Year Ended
(in millions)December 31, 2020
Fleet Retirements$4,409 
Voluntary Programs and Other Employee Benefit Charges3,409 
Receivables and Other401 
Total Restructuring Charges$8,219 
Schedule of fleet retirements by aircraft type As a result of the COVID-19 pandemic and our response, we made decisions to remove certain aircraft from active service and to early retire certain fleets. The table below summarizes the number of leased and owned aircraft being retired early, though we remain flexible and may decide to fly certain aircraft beyond their planned retirement date, to the extent supported by demand.
Fleet retirement by aircraft type
Fleet TypeNumber of AircraftPlanned Retirement During the Quarter EndedImpairment-Related Charge (in millions)
77718 December 2020$1,440 
767-300ER56 December 20251,084 
71791 December 2025950 
MD-9026 June 2020335 
CRJ-200 (1)
125 December 2023320 
737-70010 September 2020223 
A32010 June 202057 
MD-88 (2)
47 June 2020— 
Total383 $4,409 
(1)Certain of the CRJ-200 aircraft scheduled to be retired by the December 2023 quarter are operated for us by SkyWest Airlines under a revenue proration agreement.
(2)During the March 2020 quarter, we recorded a $22 million charge related to accelerating the planned retirement of the MD-88 fleet from December 2020 to June 2020. However, this amount was recorded in depreciation and amortization, rather than in restructuring charges, as it would have been incurred during 2020 prior to the onset of the COVID-19 pandemic.