XML 57 R31.htm IDEA: XBRL DOCUMENT
v3.20.1

Impact of the COVID-19 Pandemic (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 24, 2020 USD ($) | Apr. 23, 2020 USD ($) | Apr. 30, 2020 item | Mar. 31, 2020 USD ($) aircraft | Dec. 31, 2020 aircraft
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |
Liquid Assets |  |  |  | $ 644.1 |
Cash and Marketable Securities |  |  |  | 577.9 |
Line of credit facility, reduction of amount available |  |  |  | 66.2 |
Maximum borrowing capacity |  |  |  | $ 75.0 |
Forecast |  |  |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |
Number of daily departures | item |  |  | 2,500 |  |
Minimum | Subsequent event | COVID-19 |  |  |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |
Number of daily departures | item |  |  | 800 |  |
Maximum | Subsequent event |  |  |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |
CARES Act, secured loans to airline industry | $ 25,000.0 |  |  |  |
Maximum | Subsequent event | COVID-19 |  |  |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |
Number of daily departures | item |  |  | 900 |  |
PSP agreement | Subsequent event |  |  |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |
Grants receivable |  | $ 438.0 |  |  |
Grants Received Percentage |  | 50.00% |  |  |
Loan Program | Subsequent event |  |  |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 497.0 |  |  |  |
Sky West Airlines Inc | American Prorate Agreement |  |  |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |
Number of aircraft | aircraft |  |  |  | 7 |
CRJ 200 | Sky West Airlines Inc | Delta Connection Agreement |  |  |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |
Number of aircraft | aircraft |  |  |  | 55 |
CRJ 200 | Sky West Airlines Inc | American Prorate Agreement | Forecast |  |  |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |
Number of aircraft removed from service | aircraft |  |  |  |  | 7

X
- Definition The amount of cash and investments in marketable securities available to the entity. + References No definition available. + Details
Name: | skyw_CashAndMarketableSecurities
Namespace Prefix: | skyw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Approximate amount of secured loans to airline industry under Coronavirus Aid, Relief, and Economic Security Act. + References No definition available. + Details
Name: | skyw_CoronavirusAidReliefAndEconomicSecurityActApproximateAmountOfSecuredLoansToAirlineIndustry
Namespace Prefix: | skyw_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of grants received during the period. + References No definition available. + Details
Name: | skyw_GrantsReceivedPercentage
Namespace Prefix: | skyw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of availability of liquid assets to the entity. + References No definition available. + Details
Name: | skyw_LiquidAssets
Namespace Prefix: | skyw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the number of aircraft terminated under the agreement. + References No definition available. + Details
Name: | skyw_NumberOfAircraftTerminated
Namespace Prefix: | skyw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of daily departures. + References No definition available. + Details
Name: | skyw_NumberOfDailyDepartures
Namespace Prefix: | skyw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_GrantsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of aircraft operated by the carrier. + References No definition available. + Details
Name: | us-gaap_NumberOfAircraftOperated
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_UnusualRiskOrUncertaintyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnusualRiskOrUncertaintyByNatureAxis=skyw_CoronavirusDisease2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=skyw_PayrollSupportProgramAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=skyw_LoanProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=skyw_SkyWestAirlinesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=skyw_AmericanCapacityProrateAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_AircraftTypeAxis=srt_CRJ200Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=skyw_DeltaConnectionAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |