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Organization and Operations - Additional Information (Detail) $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 15, 2020 Air-craft | Apr. 03, 2020 Air-craft | Jan. 02, 2020 Air-craft | Nov. 26, 2019 Air-craft | Nov. 25, 2019 Air-craft | Jan. 31, 2019 Air-craft | Apr. 30, 2020 USD ($) Installment | Jul. 31, 2019 Air-craft | Jun. 30, 2020 USD ($) Daily_Departure State | Jun. 30, 2020 USD ($) Daily_Departure State Air-craft City Employee | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Apr. 02, 2019 Air-craft
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states in which entity operates | State |  |  |  |  |  |  |  |  | 29 | 29 |  |  |
Number of aircrafts operated |  |  |  |  |  |  |  |  |  | 145 |  |  |
Number of cities in which entity operates | City |  |  |  |  |  |  |  |  |  | 66 |  |  |
Number of daily departures | Daily_Departure |  |  |  |  |  |  |  |  | 175 | 175 |  |  |
Number of employees | Employee |  |  |  |  |  |  |  |  |  | 3,400 |  |  |
Cash and cash equivalents | $ |  |  |  |  |  |  |  |  | $ 64,934 | $ 64,934 |  | $ 68,855 |
Reducing planned heavy engine and airframe maintenance events | $ |  |  |  |  |  |  |  |  |  | 16,800 |  |  |
Drew amount from undrawn revolving credit facility | $ |  |  |  |  |  |  |  |  |  | $ 23,000 | $ 163,658 |  |
CARES act grant amount | $ |  |  |  |  |  |  | $ 92,500 |  |  |  |  |  |
CARES act, grants received | $ |  |  |  |  |  |  | 46,300 |  |  |  |  |  |
CARES act, remaining grants yet to receive | $ |  |  |  |  |  |  | $ 46,200 |  |  |  |  |  |
Number of installments to receive remaining grants | Installment |  |  |  |  |  |  | 3 |  |  |  |  |  |
CARES act, utilized offset payroll expenses | $ |  |  |  |  |  |  |  |  | 43,000 |  |  |  |
CARES act, deferred offset future payroll cost | $ |  |  |  |  |  |  |  |  | $ 3,300 |  |  |  |
CARES Act of 2020 loan amount allocated under loan program | $ |  |  |  |  |  |  | $ 277,000 |  |  |  |  |  |
Maximum number of aircraft to permanently withdraw in the event company fails to meet new/ revise performance metrics |  |  |  |  |  | 6 |  |  |  |  |  |  |
Number of aircraft converted to be utilized as operational spares |  |  |  |  |  |  |  |  |  |  |  |  | 2
Number of aircraft permanently withdraw due to failure to meet new/revised performance metrics | 2 |  |  |  |  |  |  | 2 |  |  |  |  |
American capacity purchase agreement termination notice period |  |  |  |  |  |  |  |  |  | 15 days |  |  |
Number of additional aircraft permanently withdrawn due to company's failure to meet certain performance metrics |  |  |  |  | 2 |  |  |  |  |  |  |  |
Number of deferred aircraft elected to remove |  |  | 1 |  |  |  |  |  |  |  |  |  |
Maximum number of aircraft to withdraw in the event company fails to meet new/ revise performance metrics |  |  |  |  |  |  |  |  |  | 14 |  |  |
Number of aircraft removed due to failure to meet new/revised performance metrics |  |  | 3 |  |  |  |  |  |  |  |  |  |
Number of aircraft that would be withdrawn at any time due to failure to meet new/revised performance metrics |  | 3 |  |  |  |  |  |  |  |  |  |  |
Notice period for termination of agreement |  |  |  |  |  |  |  |  |  | Our United Capacity Purchase Agreement permits United, subject to certain conditions, including the payment of certain costs tied to aircraft type, to terminate the agreement in its discretion, or remove aircraft from service, by giving us notice of 90 days or more. |  |  |
United capacity purchase agreement termination notice period |  |  |  |  |  |  |  |  |  | 30 days |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity purchase agreement, expiration year |  |  |  |  |  |  |  |  |  | 2021 |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity purchase agreement, expiration year |  |  |  |  |  |  |  |  |  | 2025 |  |  |
CRJ-900 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated |  |  |  |  |  |  |  |  |  | 54 |  |  |
CRJ-900 Aircraft [Member] | Aircraft Lease Expire In 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operated aircrafts expired or set to expire |  |  |  |  |  |  |  |  |  | 31 |  |  |
Lease expiration year |  |  |  |  |  |  |  |  |  | 2021 |  |  |
CRJ-900 Aircraft [Member] | Aircraft Lease Expire In 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operated aircrafts expired or set to expire |  |  |  |  |  |  |  |  |  | 16 |  |  |
Lease expiration year |  |  |  |  |  |  |  |  |  | 2022 |  |  |
CRJ-900 Aircraft [Member] | Aircraft Lease Expire In 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operated aircrafts expired or set to expire |  |  |  |  |  |  |  |  |  | 7 |  |  |
Lease expiration year |  |  |  |  |  |  |  |  |  | 2025 |  |  |
CRJ-700 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated |  |  |  |  |  |  |  |  |  | 20 |  |  |
CRJ-700 Aircraft [Member] | United [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aircraft lease term |  |  |  | 7 years |  |  |  |  |  |  |  |  |
E-175 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated |  |  |  | 18 |  |  |  |  |  | 60 |  |  |
Lease expiration year |  |  |  | 2028 |  |  |  |  |  |  |  |  |
E-175 Aircraft [Member] | Mesa [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated |  |  |  |  |  |  |  |  |  | 18 |  |  |
E-175 Aircraft [Member] | United [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated |  |  |  | 42 |  |  |  |  |  | 42 |  |  |
Aircraft lease extension period |  |  |  | 5 years |  |  |  |  |  |  |  |  |
E-175 Aircraft [Member] | Minimum [Member] | United [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease expiration year |  |  |  | 2024 |  |  |  |  |  |  |  |  |
E-175 Aircraft [Member] | Maximum [Member] | United [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease expiration year |  |  |  | 2028 |  |  |  |  |  |  |  |  |
E175LL Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional aircrafts |  |  |  | 20 |  |  |  |  |  |  |  |  |
Number of years in operation |  |  |  | 12 years |  |  |  |  |  |  |  |  |
Air drafts delivery month and year description. |  |  |  |  |  |  |  |  |  | Deliveries of the new E175LL aircraft were scheduled to begin in May 2020 and be completed by December 31, 2020. |  |  |
Termination of aircraft operation, description |  |  |  |  |  |  |  |  |  | Commencing five (5) years after the actual in-service date, United has the right to remove the E175LL aircraft from service by giving us notice of 90 days or more, subject to certain conditions, including the payment of certain wind-down expenses plus, if removed prior to the ten (10) year anniversary of the in-service date, certain accelerated margin payments. |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Drew amount from undrawn revolving credit facility | $ |  |  |  |  |  |  |  |  |  | $ 23,000 |  |  |

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