Income Tax Accounting Policy
Income Tax Expense (Benefit)
Effective Income Tax Rate (EITR)
Components of Deferred Tax Assets and Liabilities
Deferred Tax Assets and Liabilities, Classification
Analyst Adjustments: Removal of Deferred Taxes
Adjusted Ratios: Removal of Deferred Taxes (Summary)
Adjusted Current Ratio
Adjusted Net Profit Margin
Adjusted Total Asset Turnover
Adjusted Financial Leverage
Adjusted Return on Equity (ROE)
Adjusted Return on Assets (ROA)

Delta accounts for deferred income taxes under the liability method. Delta recognizes deferred tax assets and liabilities based on the tax effects of temporary differences between the financial statement and tax basis of assets and liabilities, as measured by current enacted tax rates. Deferred tax assets and liabilities are recorded net as noncurrent deferred income taxes.

A valuation allowance is recorded to reduce deferred tax assets when necessary. Delta periodically assesses whether it is more likely than not that Delta will generate sufficient taxable income to realize the deferred income tax assets. Delta establishes valuation allowances if it is not likely Delta will realize the deferred income tax assets. In making this determination, Delta considers all available positive and negative evidence and makes certain assumptions. Delta considers, among other things, projected future taxable income, scheduled reversals of deferred tax liabilities, the overall business environment, the historical financial results and tax planning strategies.

Source: 10-K (filing date: 2018-02-23).

Delta Air Lines Inc., income tax expense (benefit), continuing operations

USD $ in millions

	12 months ended	Dec 31, 2017		Dec 31, 2016		Dec 31, 2015		Dec 31, 2014		Dec 31, 2013
	Federal
	State and local
	International
	Current tax provision (benefit)
	Federal
	State and local
	Deferred tax provision (benefit)
	Income tax provision (benefit)

Based on: 10-K (filing date: 2018-02-23), 10-K (filing date: 2017-02-13), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-11), 10-K (filing date: 2014-02-24).

Item	Description	The company
Current tax provision (benefit)	Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.	Delta Air Lines Inc.’s current tax provision (benefit) declined from 2015 to 2016 but then increased from 2016 to 2017 exceeding 2015 level.
Deferred tax provision (benefit)	Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.	Delta Air Lines Inc.’s deferred tax provision (benefit) declined from 2015 to 2016 and from 2016 to 2017.
Income tax provision (benefit)	Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.	Delta Air Lines Inc.’s income tax provision (benefit) declined from 2015 to 2016 and from 2016 to 2017.

Delta Air Lines Inc., effective income tax rate (EITR) reconciliation

		Dec 31, 2017	Dec 31, 2016	Dec 31, 2015	Dec 31, 2014	Dec 31, 2013
	U.S. federal statutory income tax rate
	State taxes, net of federal benefit
	Decrease in valuation allowance
	Foreign tax rate differential
	Tax Cuts and Jobs Act adjustment
	Income tax allocation
	Other
	Effective income tax rate

Based on: 10-K (filing date: 2018-02-23), 10-K (filing date: 2017-02-13), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-11), 10-K (filing date: 2014-02-24).

Item	Description	The company
Effective income tax rate	Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.	Delta Air Lines Inc.’s effective income tax rate declined from 2015 to 2016 but then increased from 2016 to 2017 exceeding 2015 level.

Delta Air Lines Inc., components of deferred tax assets and liabilities

USD $ in millions

		Dec 31, 2017		Dec 31, 2016		Dec 31, 2015		Dec 31, 2014		Dec 31, 2013
	Net operating loss carryforwards
	Pension, postretirement and other benefits
	Alternative minimum tax credit carryforward
	Deferred revenue
	Other
	Deferred tax assets, gross
	Valuation allowance
	Deferred tax assets
	Depreciation
	Intangible assets
	Other
	Deferred tax liabilities
	Net deferred tax assets (liabilities)

Based on: 10-K (filing date: 2018-02-23), 10-K (filing date: 2017-02-13), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-11), 10-K (filing date: 2014-02-24).

Item	Description	The company
Deferred tax assets, gross	Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.	Delta Air Lines Inc.’s deferred tax assets, gross declined from 2015 to 2016 and from 2016 to 2017.
Deferred tax assets	Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.	Delta Air Lines Inc.’s deferred tax assets declined from 2015 to 2016 and from 2016 to 2017.
Net deferred tax assets (liabilities)	Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.	Delta Air Lines Inc.’s net deferred tax assets (liabilities) declined from 2015 to 2016 and from 2016 to 2017.

Delta Air Lines Inc., deferred tax assets and liabilities, classification

USD $ in millions

		Dec 31, 2017	Dec 31, 2016	Dec 31, 2015	Dec 31, 2014	Dec 31, 2013
	Current deferred tax assets, net
	Noncurrent deferred tax assets, net

Based on: 10-K (filing date: 2018-02-23), 10-K (filing date: 2017-02-13), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-11), 10-K (filing date: 2014-02-24).

Item	Description	The company
Noncurrent deferred tax assets, net	Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting and classified as noncurrent.	Delta Air Lines Inc.’s noncurrent deferred tax assets, net declined from 2015 to 2016 and from 2016 to 2017.

Delta Air Lines Inc., adjustments to financial data

USD $ in millions

		Dec 31, 2017	Dec 31, 2016	Dec 31, 2015	Dec 31, 2014	Dec 31, 2013
	Adjustment to Current Assets
	Current assets (as reported)
	Less: Current deferred tax assets, net
	Current assets (adjusted)
	Adjustment to Total Assets
	Total assets (as reported)
	Less: Current deferred tax assets, net
	Less: Noncurrent deferred tax assets, net
	Total assets (adjusted)
	Adjustment to Stockholders’ Equity
	Stockholders’ equity (as reported)
	Less: Net deferred tax assets (liabilities)
	Stockholders’ equity (adjusted)
	Adjustment to Net Income
	Net income (as reported)
	Add: Deferred income tax expense (benefit)
	Net income (adjusted)

Based on: 10-K (filing date: 2018-02-23), 10-K (filing date: 2017-02-13), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-11), 10-K (filing date: 2014-02-24).

Delta Air Lines Inc., Financial Data: Reported vs. Adjusted

Delta Air Lines Inc., adjusted ratios

		Dec 31, 2017	Dec 31, 2016	Dec 31, 2015	Dec 31, 2014	Dec 31, 2013
	Current Ratio
	Reported current ratio
	Adjusted current ratio
	Net Profit Margin
	Reported net profit margin
	Adjusted net profit margin
	Total Asset Turnover
	Reported total asset turnover
	Adjusted total asset turnover
	Financial Leverage
	Reported financial leverage
	Adjusted financial leverage
	Return on Equity (ROE)
	Reported ROE
	Adjusted ROE
	Return on Assets (ROA)
	Reported ROA
	Adjusted ROA

Based on: 10-K (filing date: 2018-02-23), 10-K (filing date: 2017-02-13), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-11), 10-K (filing date: 2014-02-24).

Ratio	Description	The company
Adjusted current ratio	A liquidity ratio calculated as adjusted current assets divided by adjusted current liabilities.	Delta Air Lines Inc.’s adjusted current ratio deteriorated from 2015 to 2016 and from 2016 to 2017.
Adjusted net profit margin	An indicator of profitability, calculated as adjusted net income divided by total revenue.	Delta Air Lines Inc.’s adjusted net profit margin deteriorated from 2015 to 2016 and from 2016 to 2017.
Adjusted total asset turnover	An activity ratio calculated as total revenue divided by adjusted total assets.	Delta Air Lines Inc.’s adjusted total asset turnover deteriorated from 2015 to 2016 and from 2016 to 2017.
Adjusted financial leverage	A measure of financial leverage calculated as adjusted total assets divided by adjusted total equity. Financial leverage is the extent to which a company can effect, through the use of debt, a proportional change in the return on common equity that is greater than a given proportional change in operating income.	Delta Air Lines Inc.’s adjusted financial leverage declined from 2015 to 2016 and from 2016 to 2017.
Adjusted ROE	A profitability ratio calculated as adjusted net income divided by adjusted shareholders’ equity.	Delta Air Lines Inc.’s adjusted ROE deteriorated from 2015 to 2016 and from 2016 to 2017.
Adjusted ROA	A profitability ratio calculated as adjusted net income divided by adjusted total assets.	Delta Air Lines Inc.’s adjusted ROA deteriorated from 2015 to 2016 and from 2016 to 2017.

Delta Air Lines Inc., Ratios: Reported vs. Adjusted

		Dec 31, 2017	Dec 31, 2016	Dec 31, 2015	Dec 31, 2014	Dec 31, 2013
	As Reported
	Selected Financial Data (USD $ in millions)
	Current assets
	Current liabilities
	Ratio
	Current ratio¹
	Adjusted for Deferred Taxes
	Selected Financial Data (USD $ in millions)
	Adjusted current assets
	Current liabilities
	Ratio
	Adjusted current ratio²

Based on: 10-K (filing date: 2018-02-23), 10-K (filing date: 2017-02-13), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-11), 10-K (filing date: 2014-02-24).

2017 Calculations

¹ Current ratio = Current assets ÷ Current liabilities
= hidden ÷ hidden = hidden

² Adjusted current ratio = Adjusted current assets ÷ Current liabilities
= hidden ÷ hidden = hidden

Ratio	Description	The company
Adjusted current ratio	A liquidity ratio calculated as adjusted current assets divided by adjusted current liabilities.	Delta Air Lines Inc.’s adjusted current ratio deteriorated from 2015 to 2016 and from 2016 to 2017.

		Dec 31, 2017	Dec 31, 2016	Dec 31, 2015	Dec 31, 2014	Dec 31, 2013
	As Reported
	Selected Financial Data (USD $ in millions)
	Net income
	Operating revenue
	Ratio
	Net profit margin¹
	Adjusted for Deferred Taxes
	Selected Financial Data (USD $ in millions)
	Adjusted net income
	Operating revenue
	Ratio
	Adjusted net profit margin²

Based on: 10-K (filing date: 2018-02-23), 10-K (filing date: 2017-02-13), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-11), 10-K (filing date: 2014-02-24).

2017 Calculations

¹ Net profit margin = 100 × Net income ÷ Operating revenue
= 100 × hidden ÷ hidden = hidden

² Adjusted net profit margin = 100 × Adjusted net income ÷ Operating revenue
= 100 × hidden ÷ hidden = hidden

Ratio	Description	The company
Adjusted net profit margin	An indicator of profitability, calculated as adjusted net income divided by total revenue.	Delta Air Lines Inc.’s adjusted net profit margin deteriorated from 2015 to 2016 and from 2016 to 2017.

		Dec 31, 2017	Dec 31, 2016	Dec 31, 2015	Dec 31, 2014	Dec 31, 2013
	As Reported
	Selected Financial Data (USD $ in millions)
	Operating revenue
	Total assets
	Ratio
	Total asset turnover¹
	Adjusted for Deferred Taxes
	Selected Financial Data (USD $ in millions)
	Operating revenue
	Adjusted total assets
	Ratio
	Adjusted total asset turnover²

Based on: 10-K (filing date: 2018-02-23), 10-K (filing date: 2017-02-13), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-11), 10-K (filing date: 2014-02-24).

2017 Calculations

¹ Total asset turnover = Operating revenue ÷ Total assets
= hidden ÷ hidden = hidden

² Adjusted total asset turnover = Operating revenue ÷ Adjusted total assets
= hidden ÷ hidden = hidden

Ratio	Description	The company
Adjusted total asset turnover	An activity ratio calculated as total revenue divided by adjusted total assets.	Delta Air Lines Inc.’s adjusted total asset turnover deteriorated from 2015 to 2016 and from 2016 to 2017.

		Dec 31, 2017	Dec 31, 2016	Dec 31, 2015	Dec 31, 2014	Dec 31, 2013
	As Reported
	Selected Financial Data (USD $ in millions)
	Total assets
	Stockholders’ equity
	Ratio
	Financial leverage¹
	Adjusted for Deferred Taxes
	Selected Financial Data (USD $ in millions)
	Adjusted total assets
	Adjusted stockholders’ equity
	Ratio
	Adjusted financial leverage²

Based on: 10-K (filing date: 2018-02-23), 10-K (filing date: 2017-02-13), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-11), 10-K (filing date: 2014-02-24).

2017 Calculations

¹ Financial leverage = Total assets ÷ Stockholders’ equity
= hidden ÷ hidden = hidden

² Adjusted financial leverage = Adjusted total assets ÷ Adjusted stockholders’ equity
= hidden ÷ hidden = hidden

Ratio	Description	The company
Adjusted financial leverage	A measure of financial leverage calculated as adjusted total assets divided by adjusted total equity. Financial leverage is the extent to which a company can effect, through the use of debt, a proportional change in the return on common equity that is greater than a given proportional change in operating income.	Delta Air Lines Inc.’s adjusted financial leverage declined from 2015 to 2016 and from 2016 to 2017.

		Dec 31, 2017	Dec 31, 2016	Dec 31, 2015	Dec 31, 2014	Dec 31, 2013
	As Reported
	Selected Financial Data (USD $ in millions)
	Net income
	Stockholders’ equity
	Ratio
	ROE¹
	Adjusted for Deferred Taxes
	Selected Financial Data (USD $ in millions)
	Adjusted net income
	Adjusted stockholders’ equity
	Ratio
	Adjusted ROE²

Based on: 10-K (filing date: 2018-02-23), 10-K (filing date: 2017-02-13), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-11), 10-K (filing date: 2014-02-24).

2017 Calculations

¹ ROE = 100 × Net income ÷ Stockholders’ equity
= 100 × hidden ÷ hidden = hidden

² Adjusted ROE = 100 × Adjusted net income ÷ Adjusted stockholders’ equity
= 100 × hidden ÷ hidden = hidden

Ratio	Description	The company
Adjusted ROE	A profitability ratio calculated as adjusted net income divided by adjusted shareholders’ equity.	Delta Air Lines Inc.’s adjusted ROE deteriorated from 2015 to 2016 and from 2016 to 2017.

		Dec 31, 2017	Dec 31, 2016	Dec 31, 2015	Dec 31, 2014	Dec 31, 2013
	As Reported
	Selected Financial Data (USD $ in millions)
	Net income
	Total assets
	Ratio
	ROA¹
	Adjusted for Deferred Taxes
	Selected Financial Data (USD $ in millions)
	Adjusted net income
	Adjusted total assets
	Ratio
	Adjusted ROA²

Based on: 10-K (filing date: 2018-02-23), 10-K (filing date: 2017-02-13), 10-K (filing date: 2016-02-05), 10-K (filing date: 2015-02-11), 10-K (filing date: 2014-02-24).

2017 Calculations

¹ ROA = 100 × Net income ÷ Total assets
= 100 × hidden ÷ hidden = hidden

² Adjusted ROA = 100 × Adjusted net income ÷ Adjusted total assets
= 100 × hidden ÷ hidden = hidden

Ratio	Description	The company
Adjusted ROA	A profitability ratio calculated as adjusted net income divided by adjusted total assets.	Delta Air Lines Inc.’s adjusted ROA deteriorated from 2015 to 2016 and from 2016 to 2017.

	Delta Air Lines Inc.	Other companies (not purchased previously)
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Discounted Cash Flow (DCF) Valuation
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Delta Air Lines Inc. (DAL)

Analysis of Income Taxes

Income Tax Accounting Policy

Income Tax Expense (Benefit)

Effective Income Tax Rate (EITR)

Components of Deferred Tax Assets and Liabilities

Deferred Tax Assets and Liabilities, Classification

Analyst Adjustments: Removal of Deferred Taxes

Delta Air Lines Inc., Financial Data: Reported vs. Adjusted

Adjusted Ratios: Removal of Deferred Taxes (Summary)

Delta Air Lines Inc., Ratios: Reported vs. Adjusted

Adjusted Current Ratio

Adjusted Net Profit Margin

Adjusted Total Asset Turnover

Adjusted Financial Leverage

Adjusted Return on Equity (ROE)

Adjusted Return on Assets (ROA)