Income Taxes	6 Months Ended
Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	9. Income Taxes The effective income tax expense for the three and six months ended June 30, 2020 differed from tax at the U.S. statutory rate primarily due to $6.7 million and $6.5 million of nondeductible changes in the fair value of a customer warrant liability, respectively (see Note 5 for further discussion). The effective income tax benefit for the three and six months ended June 30, 2019 differed from tax at the U.S. statutory rate primarily due to $59.8 million of tax benefits related to the favorable completion of an IRS examination of our 2015 income tax return and, for the three months ended June 30, 2019, $9.3 million of nontaxable changes in the fair value of a customer warrant liability (see Note 5 for further discussion). For interim accounting purposes, we recognize income taxes using an estimated annual effective tax rate. When finalized, the complete operational merger of Atlas and Southern Air (see Note 12 for further discussion) would result in a material increase to our deferred tax liability.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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