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v3.23.1

Organization and Operations - Additional Information (Detail) |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 24 Months Ended |
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Sep. 30, 2023 USD ($) AirCraft | Apr. 01, 2023 USD ($) Engine | Jan. 13, 2023 $ / shares shares | Dec. 20, 2019 AirCraft | Apr. 30, 2023 Engine | Mar. 31, 2023 USD ($) DailyDeparture State AirCraft Engine $ / shares shares | Jun. 30, 2023 AirCraft | Mar. 31, 2023 USD ($) DailyDeparture State AirCraft $ / shares shares | Dec. 31, 2022 USD ($) AirCraft | Sep. 30, 2022 $ / shares shares | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2023 USD ($) DailyDeparture AirCraft Employee Flighthour City Engine State $ / shares shares | Mar. 31, 2022 USD ($) | Dec. 31, 2024 USD ($) AirCraft | Apr. 03, 2023 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states in which entity operates | State |  |  |  |  |  | 42 |  | 42 |  |  |  |  | 42 |  |  |
Number of aircrafts operated | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 109 |  |  |
Number of cities in which entity operates | City |  |  |  |  |  |  |  |  |  |  |  |  | 105 |  |  |
Number of daily departures | DailyDeparture |  |  |  |  |  | 325 |  | 325 |  |  |  |  | 325 |  |  |
Number of employees | Employee |  |  |  |  |  |  |  |  |  |  |  |  | 2,388 |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  | $ (8,636,000) | $ 9,958,000 |  |
Net loss |  |  |  |  |  |  |  | $ (35,122,000) | $ (9,090,000) |  | $ (42,783,000) | $ (14,274,000) | (44,211,000) | $ (57,057,000) |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  | $ 28,600,000 |  |  |
Number of spare engines to be sold | Engine |  |  |  |  |  |  |  |  |  |  |  |  | 30 |  |  |
Number of spare engines sold | Engine |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  |  |  |  |  |  |  |  |  |  | $ 88,000,000 |  |  |
Retirement of debt from sale of productive assets |  |  |  |  |  | $ 5,600,000 |  | 5,600,000 |  |  |  |  | 5,600,000 |  |  |
Proceeds from sale of asset |  |  |  |  |  |  |  |  |  |  |  |  | 34,400,000 |  |  |
Revolving loan |  |  |  |  |  | 25,500,000 |  | 25,500,000 |  |  |  |  | 25,500,000 |  |  |
Additional prepayment with potential forgiveness |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |
Reduction in loan amount |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |
Upfront provided for flight time out-of-pocket expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Short-term debt |  |  |  |  |  | $ 145,000,000.0 |  | $ 145,000,000.0 |  |  |  |  | $ 145,000,000.0 |  |  |
Consideration For Amended Description |  |  |  |  |  |  |  |  |  |  |  |  | Also in January 2023, consideration for entering in the Amended and Restated United CPA and providing the revolving line of credit, discussed in Note 9, the Company (i) agreed to grant United the right to designate one (1) individual (the "United Designee") and (ii) issued to United 4,042,061 shares of the Company’s common stock, no par value per share, equal to approximately 10% of the Company’s issued and outstanding capital stock on such date (the "United Shares"). United's board designee rights will terminate at such time as United's equity ownership in the Company falls below five percent (5%). |  |  |
United capacity purchase agreement termination notice period |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |
Amended and restated bylaws descriptions |  |  |  |  |  |  |  |  |  |  |  |  | Pursuant to Section 3.15 of the Bylaws of the Company, United has the right to designate one person to be a member of both the Company's Board and the Board of Directors of Mesa Airlines, subject to the reasonable approval of the Board. |  |  |
Common stock, no par value | $ / shares |  |  |  |  |  | $ 0 |  | $ 0 |  | $ 0 |  |  | $ 0 |  |  |
Common stock, shares issued | shares |  |  |  |  |  | 40,619,274 |  | 40,619,274 |  | 36,376,897 |  |  | 40,619,274 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of spare engines sold | Engine |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  | $ 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of engine sold | Engine |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of debt from sale of productive assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000,000
RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft lease terminated | AirCraft |  |  |  |  |  |  |  |  | 15 |  |  |  |  |  |  |
Buyout pricing |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |
Impact of Pilot Shortage and Attrition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,600,000 |  |  |
Net loss |  |  |  |  |  |  |  |  |  |  |  |  | 44,200,000 |  |  |
Non-cash impairment charge |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,500,000 |  |  |
Captains [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increased overall hourly pay due to pilot shortage and attrition |  |  |  |  |  |  |  |  |  | 118.00% |  |  |  |  |  |
New Hire First Officers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increased overall hourly pay due to pilot shortage and attrition |  |  |  |  |  |  |  |  |  | 172.00% |  |  |  |  |  |
United Capacity Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amended and restated bylaws descriptions |  |  |  |  |  |  |  |  |  |  |  |  | On January 13, 2023, the Company’s Board of Directors approved a resolution to amend the Company’s Amended and Restated Bylaws (the “Bylaws”) in connection with the Company’s entry into the Amended and Restated United CPA, see Note 1, which provides United with the right to designate one (1) representative to be a member of the Board, provided that United holds at least five percent (5%) of the issued and outstanding shares of capital stock of the Company, and provided that such United Designee shall be subject to the reasonable approval of the Board. Until the earlier of January 1, 2026, or the Company’s entry into a definitive binding agreement for the performance of regional airline services with a major air carrier other than United, the Board shall not take, or make any recommendation to the stockholders of the Company |  |  |
United Capacity Purchase Agreement [Member] | United [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, no par value | $ / shares |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued equivalent percentage of issued and outstanding capital stock |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | shares |  |  | 4,042,061 |  |  |  |  |  |  |  |  |  |  |  |  |
Mesa Pilot Development Program [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Flight hours required to fly commercial aircraft | Flighthour |  |  |  |  |  |  |  |  |  |  |  |  | 1,500 |  |  |
CRJ-700 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000 |  |  |
Number of aircraft sold | AirCraft |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |
CRJ-700 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts listed for sale | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 18 |  |  |
Number of aircraft sold | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 18 |  |  |
Aircraft lease term |  |  |  |  |  |  |  |  |  |  |  |  | 9 years |  |  |
Number of aircraft leased | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |
CRJ-900 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts listed for sale | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |
Number of surplus aircraft to be sold | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,200,000 |  |  |
Number of aircraft sold | AirCraft |  |  |  |  |  |  |  | 4 |  |  |  |  | 11 |  |  |
Number of aircraft classified as assets held for sale | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |
Gross proceeds from sale of asset |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,000,000 |  |  |
Expected gross proceeds from sale of asset |  |  |  |  |  |  |  |  |  |  |  |  | 72,000,000 |  |  |
Retirement of debt from sale of productive assets |  |  |  |  |  | $ 69,000,000 |  | $ 69,000,000 |  |  |  |  | $ 69,000,000 |  |  |
CRJ-900 Aircraft [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AirCraft | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset | $ 21,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CRJ-900 Aircraft [Member] | Export Development Bank of Canada Agreement [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |
Maximum liquidity provided |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,000,000 |
CRJ-900 Aircraft [Member] | RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft to be sold | AirCraft |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |
Number of aircraft lease terminated | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |
Buyout pricing |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |
Buyout price |  |  |  |  |  |  |  |  |  |  |  |  | $ 52,000,000 |  |  |
CRJ-900 Aircraft [Member] | American Capacity Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated | AirCraft |  |  |  |  |  |  |  | 40 |  |  |  |  |  |  |  |
CRJ-900 Aircraft [Member] | United Capacity Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated | AirCraft |  |  |  |  |  | 10 |  |  |  |  |  |  | 10 |  |  |
Maximum number of aircraft to be operated | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 38 |  |  |
CRJ-200 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts listed for sale | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 60 |  |  |
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 42 |  |  |
Number of aircrafts owned | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 18 |  |  |
Lease expiration year |  |  |  |  |  |  |  |  |  |  |  |  | 2028 |  |  |
Notice period for termination of agreement |  |  |  |  |  |  |  |  |  |  |  |  | United, subject to certain conditions, including the payment of certain costs tied to aircraft type, may terminate the agreement in its discretion, or remove E-175 aircraft from service, by giving us notice of 90 days or more |  |  |
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease expiration year |  |  |  |  |  |  |  |  |  |  |  |  | 2024 |  |  |
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease expiration year |  |  |  |  |  |  |  |  |  |  |  |  | 2028 |  |  |
E175LL Aircraft [Member] | United Capacity Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Air crafts expiring month and year description |  |  |  |  |  |  |  |  |  |  |  |  | in 2032 and 2033 |  |  |
Boeing 737400F [Member] | DHL Flight Services Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated | AirCraft |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Aircraft lease term |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft leased | AirCraft |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Notice period for termination of agreement |  |  |  |  |  |  |  |  |  |  |  |  | At any time after the first anniversary of the commencement date of the first aircraft placed in service with 90 days' written notice. |  |  |
Aircraft option to extend agreement description |  |  |  |  |  |  |  |  |  |  |  |  | DHL has the option to extend the agreement with respect to one (1) or more aircraft for a period of one (1) year with 90 days’ advance written notice. |  |  |
Boeing 737-800F [Member] | DHL Flight Services Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft leased | AirCraft |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Pipistrel Alpha Trainer 2 Aircraft [Member] | Mesa Pilot Development Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts purchased | AirCraft |  |  |  |  |  |  |  |  |  |  |  |  | 29 |  |  |
Flight costs per hour |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |

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