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Cover Page
 9 Months Ended
Jun. 30, 2025
Document Information [Line Items]  
Document Type S-4
Amendment Flag false
Entity Registrant Name MESA AIR GROUP, INC.
Entity Central Index Key 0000810332
Entity Filer Category Non-accelerated Filer
Entity Small Business false
Entity Emerging Growth Company false
Entity Incorporation, State or Country Code NV
Entity Primary SIC Number 4512
Entity Tax Identification Number 85-0302351
Entity Address, Address Line One 410 North 44th Street
Entity Address, Address Line Two Suite 700
Entity Address, City or Town Phoenix
Entity Address, State or Province AZ
Entity Address, Postal Zip Code 85008
City Area Code 602
Local Phone Number 685-4000
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One 410 North 44th Street
Entity Address, Address Line Two Suite 700
Entity Address, City or Town Phoenix
Entity Address, State or Province AZ
Entity Address, Postal Zip Code 85008
City Area Code 602
Local Phone Number 685-4000
Contact Personnel Name Michael J. Lotz