XML 48 R36.htm IDEA: XBRL DOCUMENT v3.21.2

Long-Term Debt (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) Aircraft	Jun. 30, 2020 USD ($)
Termination Loans			$ 19.8
Senior Secured Revolving Credit Facility
Debt Instrument, Term	24 months
Number Of Aircrafts Included As Collateral | Aircraft		0
Airbus A320 Aircraft Series | Senior Secured Revolving Credit Facility
Debt Instrument, Face Amount	$ 50.0	$ 50.0

X

- Definition

Number Of Aircrafts Included As Collateral

+ References

No definition available.

+ Details

Name:	algt_NumberOfAircraftsIncludedAsCollateral
Namespace Prefix:	algt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Definite liabilities to third parties under a termination loan agreement, whether or not guaranteed in whole or in part by the government.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 405
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68073528&loc=d3e56288-109415

+ Details

Name:	us-gaap_TerminationLoans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=algt_SeniorSecuredRevolvingCreditFacilityDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=algt_AirbusA320AircraftSeriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: