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Schedule II Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2017

Schedule II Valuation and Qualifying Accounts

Schedule II

Valuation and Qualifying Accounts

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

(In millions) Description		Balance at Beginning of Period				Additions Charged to Costs and Expenses				Deductions (a)				Other				Balance at End of Period
Allowance for doubtful accounts—UAL and United:
2017		$	10			$	20			$	23			$	—			$	7
2016			18				18				26				—				10
2015			22				25				29				—				18
Obsolescence allowance—spare parts—UAL and United:
2017		$	295			$	75			$	17			$	1			$	354
2016			235				61				16				15				295
2015			169				38				—				28				235
Valuation allowance for deferred tax assets—UAL:
2017		$	68			$	11			$	27			$	11			$	63
2016			48				47				27				—				68
2015			4,751				—				4,703				—				48
Valuation allowance for deferred tax assets—United:
2017		$	68			$	11			$	27			$	11			$	63
2016			48				47				27				—				68
2015			4,721				—				4,673				—				48

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

X

- Definition

The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-URI http://asc.fasb.org/topic&trid=2122369

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