UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number Exact Name of Registrant as Specified in its Charter, Principal Executive Office Address and Telephone Number State of Incorporation I.R.S. Employer I ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to | Exact Name of Registrant as Specified in its Charter, State of I.R.S. Employer | Commission | | | | --- | --- | --- | --- | | Incorporation Identifica ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION | Commission File Number | Exact Name of Registrant as Specified in its Charter, Principal Executive Office Address and Telephone Number | | | | State of Incorporation | I.R.S. Employer Identification No. | | --- | --- | --- | --- | --- | --- | --- | | 001-06033 | United Airlines Holdings, Inc. | | | | Delaware | 36-2675207 | | | 233 South Wacker Drive, | | Chicago, Illinois | 60606 | | | | | (872) | 825-4000 | | | | | | 001-10323 | United Airlines, Inc. | | ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to | Commission File Number | Exact Name of Registrant as Specified in its Charter, Principal Executive Office Address and Telephone Number | | | State of Inc ...

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 ...

(Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to | Commission File Number | Exact Name of Registrant as Specified in its Charter, Principal Executive Office Address and Telephone Number | | State of Incorporation | I.R.S. Employer Identification No. | | --- | --- | --- | --- | --- ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to | Commission State of I.R.S. Employer Former Name, Former Address and Former | Exact Name of Registrant as Specified in its Charter, | | | | | | --- | --- | ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to | Commission State of I.R.S. Employer | Exact Name of Registrant as Specified in its Charter, | | | | | --- | --- | --- | --- | --- | | File Number Princip ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number Exact Name of Registrant as Specified in its Charter, Principal Executive Office Address, Zip Code and Telephone Number, Including Area Code State of ...