Item 16. FORM 10-K SUMMARY.

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Item 16. FORM 10-K SUMMARY.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, each registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

UNITED CONTINENTAL HOLDINGS, INC. UNITED AIRLINES, INC. (Registrants)
By:/s/ Andrew C. Levy
Andrew C. Levy
Executive Vice President and Chief Financial Officer

Date: February 22, 2018

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of United Continental Holdings, Inc. and in the capacities and on the date indicated.

SignatureCapacity
/s/ Oscar Munoz Oscar MunozChief Executive Officer, Director (Principal Executive Officer)
/s/ Andrew C. Levy Andrew C. LevyExecutive Vice President and Chief Financial Officer (Principal Financial Officer)
/s/ Chris Kenny Chris KennyVice President and Controller (Principal Accounting Officer)
/s/ Carolyn Corvi Carolyn CorviDirector
/s/ Jane C. Garvey Jane C. GarveyDirector
/s/ Barney Harford Barney HarfordDirector
/s/ Todd M. Insler Todd M. InslerDirector
/s/ Walter Isaacson Walter IsaacsonDirector
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SignatureCapacity
/s/ James A.C. Kennedy James A.C. KennedyDirector
/s/ Robert A. Milton Robert A. MiltonDirector
/s/ William R. Nuti William R. NutiDirector
/s/ Sito Pantoja Sito PantojaDirector
/s/ Edward M. Philip Edward M. PhilipDirector
/s/ Edward L. Shapiro Edward L. ShapiroDirector
/s/ Laurence E. Simmons Laurence E. SimmonsDirector
/s/ David J. Vitale David J. VitaleDirector
/s/ James M. Whitehurst James M. WhitehurstDirector

Date: February 22, 2018

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of United Airlines, Inc. and in the capacities and on the date indicated.

SignatureCapacity
/s/ Oscar Munoz Oscar MunozChief Executive Officer, Director (Principal Executive Officer)
/s/ Andrew C. Levy Andrew C. LevyExecutive Vice President and Chief Financial Officer, Director (Principal Financial Officer)
/s/ Chris Kenny Chris KennyVice President and Controller (Principal Accounting Officer)
/s/ Gregory L. Hart Gregory L. HartDirector
/s/ J. Scott Kirby J. Scott KirbyDirector

Date: February 22, 2018

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Schedule II

Valuation and Qualifying Accounts

For the Years Ended December 31, 2017, 2016 and 2015

(In millions) DescriptionBalance at Beginning of PeriodAdditions Charged to Costs and ExpensesDeductions (a)OtherBalance at End of Period
Allowance for doubtful accounts—UAL and United:
2017$10$20$23$—$7
2016181826—10
2015222529—18
Obsolescence allowance—spare parts—UAL and United:
2017$295$75$17$1$354
2016235611615295
201516938—28235
Valuation allowance for deferred tax assets—UAL:
2017$68$11$27$11$63
2016484727—68
20154,751—4,703—48
Valuation allowance for deferred tax assets—United:
2017$68$11$27$11$63
2016484727—68
20154,721—4,673—48

(a) Deduction from reserve for purpose for which reserve was created.

Previous: Item 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.