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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Firm Commitments and Options to Purchase Aircraft and Summary of Commitments As of March 31, 2022, United had firm commitments and options to purchase aircraft from The Boeing Company ("Boeing") and Airbus S.A.S. ("Airbus") as presented in the table below:
Scheduled Aircraft Deliveries
Aircraft TypeNumber of Firm
 Commitments (a)		Last Nine Months
of 2022		2023After 2023
Airbus A321XLR50 — — 50 
Airbus A321neo70 — 12 58 
Airbus A35045 — — 45 
Boeing 737 MAX367 53 109 205 
Boeing 7878 8 — — 
(a) United also has options and purchase rights for additional aircraft.
Summary of Commitments
The table below summarizes United's commitments as of March 31, 2022, which include aircraft and related spare engines, aircraft improvements and all non-aircraft capital commitments (in billions):
Last nine months of 2022$5.4 
20237.7 
20245.0 
20254.4 
20263.4 
After 20268.8 
$34.7