Debt - 2019-1 EETC (Details) - Secured Debt	6 Months Ended
Jun. 30, 2019 USD ($) aircraft
Pass Through Certificates Series 2019-1
Debt Instrument [Line Items]
Debt instrument face amount	$ 500,000,000
Number of aircraft to secure debt \| aircraft	14
2019-1 Class AA Certificates
Debt Instrument [Line Items]
Debt instrument face amount	$ 425,000,000
Fixed interest rate (percent)	3.204%
Final maturity date	Apr. 30, 2024
2019-1 Class A Certificates
Debt Instrument [Line Items]
Debt instrument face amount	$ 75,000,000
Fixed interest rate (percent)	3.404%
Final maturity date	Apr. 30, 2024

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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+ References

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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