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COVID-19 PANDEMIC (Details) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
May 14, 2020 aircraft | Mar. 31, 2020 USD ($) aircraft
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | $ 145.0
Number of Mainline Aircraft Parked | aircraft |  | 146
Impairment of Intangible Assets, Finite-lived |  | $ 10.0
Accounts Receivable, Allowance for Credit Loss, Writeoff |  | $ 5.0
Number of Mainline Aircraft Parked | aircraft |  | 146
Number of Horizon Aircraft Parked | aircraft |  | 13
Number of SkyWest Aircraft Suspended | aircraft |  | 8
Subsequent Event [Member] |  |
Impaired Long-Lived Assets [Line Items] |  |
Number of Mainline Aircraft Parked | aircraft | 10 |
Number of Mainline Aircraft Parked | aircraft | 10 |
Aircraft [Member] |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | $ 69.0
Operating Lease Asset |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | 62.0
Disposal Group, Held-for-sale, Not Discontinued Operations |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | 4.0
Inventories |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | 2.0
Lease Return Costs |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | 8.0
Airbus [Member] |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | $ 83.0
Aircraft Permanently Parked | aircraft |  | 12
Aircraft Permanently Parked | aircraft |  | 12
Airbus [Member] | Aircraft [Member] |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | $ 11.0
Airbus [Member] | Operating Lease Asset |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | 62.0
Airbus [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | 0.0
Airbus [Member] | Inventories |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | 2.0
Airbus [Member] | Lease Return Costs |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | 8.0
Q400 [Member] |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | $ 62.0
Aircraft Permanently Parked | aircraft |  | 2
Aircraft Permanently Parked | aircraft |  | 2
Q400 [Member] | Aircraft [Member] |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | $ 58.0
Q400 [Member] | Operating Lease Asset |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | 0.0
Q400 [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | 4.0
Q400 [Member] | Inventories |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | 0.0
Q400 [Member] | Lease Return Costs |  |
Impaired Long-Lived Assets [Line Items] |  |
Asset Impairment Charges |  | $ 0.0

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