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Long-term Debt, Short-term Borrowings, and Capital Lease Obligations Short Term Borrowings (Policies)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Short-term Debt [Text Block]	Short-term Borrowings Citibank Line of Credit In August 2019, we amended and restated our revolving Credit and Guaranty Agreement with Citibank, N.A. as the administrative agent. The amendment increased our borrowing capacity by $125 million to $550 million and extended the term of the facility through August 2023. Borrowings under the Credit and Guaranty Agreement bear interest at a variable rate equal to LIBOR, plus a margin. The Credit and Guaranty Agreement is secured by Slots at John F. Kennedy International Airport, LaGuardia Airport, and Reagan National Airport, as well as certain other assets. Slots are rights to take-off or land at a specific airport during a specific time period during the day and a means by which airport capacity and congestion can be managed. The Credit and Guaranty Agreement includes covenants that require us to maintain certain minimum balances in unrestricted cash, cash equivalents, and unused commitments available under revolving credit facilities. In addition, the covenants restrict our ability to, among other things, dispose of certain collateral, or merge, consolidate, or sell assets. As of and for the years ended December 31, 2019 and 2018, we did not have a balance outstanding or borrowings under this line of credit. Morgan Stanley Line of Credit We have a revolving line of credit with Morgan Stanley for up to approximately $200 million. This line of credit is secured by a portion of our investment securities held by Morgan Stanley and the amount available to us under this line of credit may vary accordingly. This line of credit bears interest at a floating rate based upon LIBOR, plus a margin. As of and for the years ended December 31, 2019 and 2018, we did not have a balance outstanding or borrowings under this line of credit.