Item 2. PROPERTIES.

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Item 2. PROPERTIES.

Fleet. As of December 31, 2023, United's mainline and regional fleets consisted of the following:


Aircraft Type	Total	Owned	Leased	Seats in Standard Configuration	Average Age (In Years)
Mainline:
777-300ER	22	22	—	350	6.0
777-200ER	55	54	1	276-362	23.8
777-200	19	19	—	364	26.5
787-10	21	21	—	318	3.2
787-9	38	34	4	257	6.3
787-8	12	12	—	243	10.5
767-400ER	16	16	—	231	22.3
767-300ER	37	37	—	167-203	27.8
757-300	21	21	—	234	21.3
757-200	40	39	1	176	26.9
737 MAX 9	79	63	16	179	2.0
737 MAX 8	80	34	46	166	1.0
737-900ER	136	136	—	179	11.0
737-900	12	10	2	179	22.3
737-800	141	119	22	166	19.8
737-700	40	38	2	126	24.8
A321neo	4	4	—	200	0.1
A320-200	91	81	10	150	24.9
A319-100	81	52	29	126	22.1
Total mainline	945	812	133		16.0


Aircraft Type	Total	Owned	Owned or Leased by Regional Carrier	Regional Carrier Operator and Number of Aircraft		Seats in Standard Configuration
Regional:
Embraer E175/E175LL	189	73	116	SkyWest: Mesa: Republic:	90 54 45	70/76
Embraer 170	21	—	21	Republic:	21	70
CRJ900	26	—	26	Mesa:	26	76
CRJ700	19	—	19	SkyWest:	19	70
CRJ550	35	2	33	GoJet:	35	50
CRJ200	70	—	70	SkyWest:	70	50
Embraer ERJ 145XR	53	53	—	CommuteAir:	53	50
Total regional	413	128	285

In addition to the aircraft presented in the table above, United owned or leased the following regional aircraft as of December 31, 2023:

24 CRJ550s, 26 E175/E175LLs and 45 Embraer ERJ 145s that were temporarily grounded; and
8 CRJ700s awaiting conversion to CRJ550s.

Firm Order and Option Aircraft. As of December 31, 2023, United had firm commitments to purchase aircraft from Boeing and Airbus presented in the table below:


		Contractual Aircraft Deliveries			Expected Aircraft Deliveries (b)
Aircraft Type	Number of Firm Commitments (a)	2024	2025	After 2025	2024	2025	After 2025
787	150	8	18	124	7	18	125
737 MAX 8	43	43	—	—	37	6	—
737 MAX 9	34	34	—	—	19	15	—
737 MAX 10	277	80	71	126	—	(c)	(c)
A321neo	126	26	38	62	25	24	77
A321XLR	50	—	8	42	—	1	49
A350	45	—	—	45	—	—	45
(a) United also has options and purchase rights for additional aircraft.
(b) Expected aircraft deliveries reflect adjustments communicated by Boeing and Airbus or estimated by United.
(c) Due to the delay in the certification of the 737 MAX 10 aircraft, we are unable to accurately forecast the expected delivery period.

The aircraft listed in the table above are scheduled for delivery through 2033. The amount and timing of the Company's future capital commitments could change to the extent that: (i) the Company and the aircraft manufacturers, with whom the Company has existing orders for new aircraft, agree to modify the contracts governing those orders; (ii) rights are exercised pursuant to the relevant agreements to cancel deliveries or modify the timing of deliveries; or (iii) the aircraft manufacturers are unable to deliver in accordance with the terms of those orders.

See Note 12 to the financial statements included in Part II, Item 8 of this report for additional information.

Facilities. United leases gates, hangar sites, terminal buildings and other airport facilities in the municipalities it serves. United has major terminal facility leases at SFO, IAD, ORD, LAX, DEN, EWR, IAH and GUM with expiration dates ranging from 2024 through 2053. Substantially all of these facilities are leased on a net-rental basis, resulting in the Company having financial responsibility for maintenance, insurance and other facility-related expenses and services.

United also maintains administrative, catering, cargo, training, maintenance and other facilities to support its operations in the cities it serves. In addition, United has multiple leases, which expire from 2029 through 2033, for its principal executive office and operations center in downtown Chicago and administrative offices in downtown Houston.

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