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0 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 United Airlines Holdings , Inc. United Airlines , Inc. TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from Commission File Number 001-06033 United Airlines Holdings , Inc. United Airlines , Inc. UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , DC 20549 001-10323 0 to FORM 10 - K United Airlines , Inc. 233 South Wacker Drive , ( 872 ) 825-4000 Exact Name of Registrant as Specified in its Charter , Principal Executive Office Address and Telephone Number United Airlines Holdings , Inc. 233 South Wacker Drive , ( 872 ) 825-4000 Title of Each Class Common Stock , $ 0.01 par value Preferred Stock Purchase Rights None UNITED OR Chicago , Illinois 60606 Chicago , Illinois UAL Yes 0 No Yes 0 No | Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol None United Airlines Holdings , Inc. United Airlines , Inc. 60606 State of Incorporation Delaware Delaware Securities registered pursuant to Section 12 ( g ) of the Act : None None Accelerated filer filer Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act United Airlines Holdings , Inc. United Airlines , Inc. Yes No 0 Yes No United Airlines , Inc. Yes 0 No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . United Airlines Holdings , Inc. Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes I.R.S. Employer Identification No. The Nasdaq Stock Market LLC The Nasdaq Stock Market LLC None No 0 United Airlines , Inc. Yes United Airlines Holdings , Inc. Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this Chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . United Airlines Holdings , Inc. Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Yes No United Airlines , Inc. Yes No United Airlines Holdings , Inc. Large accelerated filer Large accelerated filer Non accelerated filer Non - accelerated United Airlines , Inc. Accelerated filer If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . 0 36-2675207 Name of Each Exchange on Which Registered 74-2099724 DOCUMENTS INCORPORATED BY REFERENCE Smaller reporting company Smaller reporting company 0 Yes United Airlines Holdings , Inc. United Airlines , Inc. Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . United Airlines Holdings , Inc. United Airlines , Inc. Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . No United Airlines Holdings , Inc. shares of common stock ( $ 0.01 par value ) 318,476,280 1,000 United Airlines , Inc. shares of common stock ( $ 0.01 par value ) ( 100 % owned by United Airlines Holdings , Inc. ) This combined Form 10 - K is separately filed by United Airlines Holdings , Inc. and United Airlines , Inc. OMISSION OF CERTAIN INFORMATION No Emerging growth company Emerging growth company 0 The aggregate market value of common stock held by non - affiliates of United Airlines Holdings , Inc. was $ 10.0 billion as of June 30 , 2020 based on the closing sale price of $ 34.61 on that date . There is no market for United Airlines , Inc. common stock . Indicate the number of shares outstanding of each of the registrant's classes of common stock , as of February 24 , 2021 . 0 United Airlines , Inc. meets the conditions set forth in General Instruction I ( 1 ) ( a ) and ( b ) of Form 10 - K and is therefore filing this form with the reduced disclosure format allowed under that General Instruction .