Contingencies	12 Months Ended
Contingencies	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies We self-insure a portion of our losses from claims related to workers’ compensation, environmental issues, property damage, medical insurance for crewmembers, and general liability. Losses are accrued based on an estimate of the ultimate aggregate liability for claims incurred, using standard industry practices and our actual experience. We are a party to many routine contracts under which we indemnify third parties for various risks. These indemnities consist of the following: All of our bank loans, including our aircraft mortgages obligate us to reimburse the bank for any increased costs arising from regulatory changes, including changes in reserve requirements and bank capital requirements; these obligations are standard terms present in loans of this type. These indemnities would increase the interest rate on our debt if they were to be triggered. In all cases, we have the option to repay the loan and avoid the increased costs. These terms match the length of the related loan up to 15 years. Under both aircraft leases with foreign lessors and aircraft mortgages with foreign lenders, we have agreed to customary indemnities concerning withholding tax law changes. Under these contracts we are responsible, should withholding taxes be imposed, for paying such amount of additional rent or interest as is necessary to ensure that the lessor or lender still receives, after taxes, the rent stipulated in the lease or the interest stipulated under the loan. The term of these indemnities matches the length of the related lease or loan up to 20 years. We have various leases with respect to real property as well as various agreements among airlines relating to fuel consortia or fuel farms at airports. Under these contracts we have agreed to standard language indemnifying the lessor against environmental liabilities associated with the real property or operations described under the agreement, even if we are not the party responsible for the initial event that caused the environmental damage. In the case of fuel consortia at airports, these indemnities are generally joint and several among the participating airlines. We have purchased a standalone environmental liability insurance policy to help mitigate this exposure. Our existing aviation hull and liability policy includes some limited environmental coverage when a cleanup is part of an associated single identifiable covered loss. Under certain contracts, we indemnify specified parties against legal liability arising out of actions by other parties. The terms of these contracts range up to 25 years. Generally, we have liability insurance protecting ourselves for the obligations we have undertaken relative to these indemnities. We are unable to estimate the potential amount of future payments under the foregoing indemnities and agreements. Under a certain number of our operating lease agreements we are required to restore certain property or equipment to its original form upon expiration of the related agreement. We have recorded the estimated fair value of these retirement obligations of approximately $5 million as of December 31, 2020. This liability may increase over time. Legal Matters Occasionally, we are involved in various claims, lawsuits, regulatory examinations, investigations, and other legal matters involving suppliers, crewmembers, customers, and governmental agencies, arising, for the most part, in the ordinary course of business. The outcome of litigation and other legal matters is always uncertain. The Company believes it has valid defenses to the legal matters currently pending against it, is defending itself vigorously, and has recorded accruals determined in accordance with GAAP, where appropriate. In making a determination regarding accruals, using available information, we evaluate the likelihood of an unfavorable outcome in legal or regulatory proceedings to which we are a party and record a loss contingency when it is probable a liability has been incurred and the amount of the loss can be reasonably estimated. These subjective determinations are based on the status of such legal or regulatory proceedings, the merits of our defenses, and consultation with legal counsel. Actual outcomes of these legal and regulatory proceedings may materially differ from our current estimates. It is possible that resolution of one or more of the legal matters currently pending or threatened could result in losses material to our consolidated results of operations, liquidity, or financial condition. To date, none of these types of litigation matters, most of which are typically covered by insurance, has had a material impact on our operations or financial condition. We have insured and continue to insure against most of these types of claims. A judgment on any claim not covered by, or in excess of, our insurance coverage could materially adversely affect our consolidated results of operations, liquidity, or financial condition.