UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Securities registered pursuant to Section 12(b) of the Act: Title of Each Class Trading Symbol Name of Each Exchange on Which Registered United Airlines Holdings, Inc. Common Stock, $0.01 par value UAL The Nasdaq Stock Market LLC United Airlines, Inc. None None None Securities registered pursuant to Section 12(g) of the Act: United Airlines Holdings, Inc. None United Airlines, Inc. None Indicate by check mark if the registrant is a well-k ...