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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2024
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Firm Commitments As of June 30, 2024, United had firm commitments to purchase aircraft from The Boeing Company ("Boeing") and Airbus S.A.S. ("Airbus") as presented in the table below:
Contractual Aircraft Deliveries (b)Expected Aircraft Deliveries (c)
Aircraft TypeNumber of Firm
 Commitments (a)
Last Six Months
of 2024
2025After 2025Last Six Months
of 2024
2025After 2025
787150 18 124 11 135 
737 MAX 833 33 — — 16 17 — 
737 MAX 9143 33 40 70 44 90 
737 MAX 10167 — — 167 — — 167 
A321neo118 18 22 78 18 22 78 
A321XLR50 — — 50 — — 50 
A35045 — — 45 — — 45 
(a) United also has options and purchase rights for additional aircraft.
(b) Contractual aircraft deliveries reflect an agreement United entered into with Airbus on July 16, 2024 to adjust delivery schedules for the A321neo ("Airbus Agreement").
(c) Expected aircraft deliveries reflect adjustments to contractual delivery schedules as communicated by Boeing and Airbus or estimated by United. However, aircraft deliveries are subject to a number of variables, as further described in Part I, Item 1A. Risk Factors of the 2023 Form 10-K, and we cannot guarantee delivery of any particular aircraft at any specific time notwithstanding firm purchase commitments.
Schedule of Commitments
The table below summarizes United's firm commitments as of June 30, 2024, which include aircraft and related spare engines, aircraft improvements and non-aircraft capital commitments. Aircraft commitments are based on contractual scheduled aircraft deliveries without any adjustments communicated by Boeing and Airbus or estimated by United but reflecting the Airbus Agreement and the April 14, 2024 arrangements between United and Boeing.
(in billions)
Last six months of 2024$5.6 
20256.6 
20265.5 
20274.7 
20287.2 
After 202827.8 
$57.4 
Schedule of Estimated Future payments of Contractual Obligation Based on these assumptions as of June 30, 2024, our estimated future payments through the end of the terms of our CPAs are presented in the table below:
(in billions)
Last six months of 2024$1.3 
20252.4 
20262.2 
20271.7 
20281.4 
After 20284.3 
$13.3