Exhibit 21

United Airlines Holdings, Inc. and United Airlines, Inc. Subsidiaries

(as of February 18, 2022)

Entity				Jurisdiction of Incorporation
United Airlines Holdings, Inc.				Delaware
Wholly-owned subsidiaries*:
United Airlines, Inc.				Delaware
	● Air Wis Services, Inc.			Wisconsin
		● Air Wisconsin, Inc.		Delaware
		● Domicile Management Services, Inc. **		Delaware
	● Air Micronesia, LLC.			Delaware
	● CAL Cargo, S.A. de C.V.**			Mexico
	● CALFINCO Inc.			Delaware
		● CALFINCO Caymans Ltd.		Cayman Islands
	● Century Casualty Company			Vermont
	● Continental Airlines de Mexico, S.A.**			Mexico
	● Continental Airlines Domain Name Limited			England
	● Continental Airlines Finance Trust II			Delaware
	● Continental Airlines Fuel Purchasing Group, LLC			Delaware
	● Continental Airlines, Inc. Supplemental Retirement Plan for Pilots Trust Agreement			Delaware
	● Continental Airlines Purchasing Holdings LLC			Delaware
		● Continental Airlines Purchasing Services LLC**		Delaware
	● Continental Express, Inc.			Delaware
	● Covia LLC			Delaware
	● Mileage Plus Holdings, LLC			Delaware
		● MPH I, Inc.		Delaware
			●Mileage Plus Marketing, Inc.	Delaware
		● Mileage Plus, Inc.		Delaware
		● Mileage Plus Intellectual Property Assets, Ltd. ***		Cayman Islands
		● Mileage Plus Intellectual Property Assets Aggregator, Ltd.		Cayman Islands
		● Mileage Plus Intellectual Property Assets Holdings UIP, Ltd.		Cayman Islands
		● Mileage Plus Intellectual Property Assets Holdings MIP, Ltd.		Cayman Islands
		● Mileage Plus Intellectual Property Assets SPV Partner, Ltd.****		Cayman Islands
		● Mileage Plus Intellectual Property Assets GP S.à r.l.*****		Luxembourg
		● Mileage Plus Intellectual Property Assets Lux 2 SCS*****		Luxembourg
		● Mileage Plus Intellectual Property Assets Lux 1 SCS*****		Luxembourg
	● Presidents Club of Guam, Inc.			Delaware
	● UABSPL Holdings, Inc.			Delaware
	● UAL Benefits Management, Inc.**			Delaware
	● United Atlantic LP**			Delaware
		● United Atlantic Services C.V.**		Netherlands
			●United Atlantic Corporate LLC	Delaware
			●United Atlantic Corporate Center C.V.**	Netherlands
	● United Atlantic B.V.			Netherlands
	● United Atlantic Services LLC			Delaware

● United Aviation Fuels Corporation	Delaware
● United Airlines Ventures, Ltd.	Cayman Islands
● United Airlines Business Services Private Limited**	India
● United Ground Express, Inc.	Delaware
● United Travel Services, LLC	Delaware
● United Vacations, Inc.	Delaware
● Westwind School of Aeronautics of Phoenix, LLC	Arizona

*Subsidiaries of United Airlines Holdings, Inc. are wholly owned unless otherwise indicated

**Domicile Management Services Inc. is 99.9% owned by Air Wis Services, Inc. and 0.1% owned by United Airlines, Inc. CAL Cargo, S.A. de C.V. is 99.99% owned by United Airlines, Inc. and .01% owned by CALFINCO Inc. Continental Airlines de Mexico, S.A. is 99.9997% owned by United Airlines, Inc. and .0003% owned by private entities. Continental Airlines Purchasing Services LLC is 99% owned by Continental Airlines Purchasing Holdings LLC and 1% owned by United Airlines, Inc. UAL Benefits Management, Inc. has 100% of its Class A Common Stock owned by United Airlines, Inc. and 100% of its Class B Common Stock owned by Health Care Services Corporation. United Atlantic LP is 99.9% owned by United Airlines, Inc. and 0.1% owned by United Atlantic Services LLC. United Atlantic Services C.V. is 99.9% owned by United Atlantic LP and 0.1% owned by United Atlantic Services LLC. United Atlantic Corporate Center C.V. is 99.9% owned by United Atlantic Services C.V. and 0.1% owned by United Atlantic Corporate LLC. United Airlines Business Services Private Limited is 99.99% owned by United Airlines, Inc. and 0.01% owned by UABSPL Holdings, Inc. on behalf of United Airlines, Inc.

*** 1 special share in Mileage Plus Intellectual Property Assets, Ltd. is held by a third party share trustee

**** Mileage Plus Intellectual Property Assets SPV Partner, Ltd. is a wholly owned subsidiary of Mileage Plus Intellectual Property Assets, Ltd.

***** Mileage Plus Intellectual Property Assets Lux 1 SCS is 4.76% owned by Mileage Plus Intellectual Property Assets GP S.à r.l. and 95.23% owned by Mileage Plus Intellectual Property Assets Lux 2 SCS, which itself is 4.76% owned by Mileage Plus Intellectual Property Assets GP S.à r.l. and 95.23% owned by Mileage Plus Intellectual Property Assets, Ltd.