Item 2. PROPERTIES.

Fleet. As of December 31, 2021, United's mainline and regional fleets consisted of the following:

In addition to the aircraft presented in the table above, United owned or leased, as of December 31, 2021, seven Boeing 757-200s, 13 Boeing 737-700s, 17 Airbus A319s, three Airbus A320s and one Boeing 767-200 that are not used in its operations.

In addition to the aircraft presented in the table above, United owned or leased the following regional aircraft as of December 31, 2021:

• 11 CRJ700s awaiting conversion to CRJ550s; and

• 85 Embraer ERJ 145s, which are temporarily grounded, 56 of which are currently held for sale.

Firm Order and Option Aircraft. As of December 31, 2021, United had firm commitments and options to purchase aircraft from Boeing and Airbus presented in the table below:

The aircraft listed in the table above are scheduled for delivery through 2030. To the extent the Company and the aircraft manufacturers with whom the Company has existing orders for new aircraft agree to modify the contracts governing those orders, or to the extent rights are exercised pursuant to the relevant agreements to modify the timing of deliveries, the amount and timing of the Company's future capital commitments could change.

See Notes 10 and 13 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 2022 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. In November 2021, United purchased off-lease its backup network operations center in Arlington Heights, Illinois, which, effective April 1, 2022, will become the Company's primary network operations center.