v3.25.3
Cover - shares
 9 Months Ended
Sep. 30, 2025
Nov. 07, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Sep. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q3  
Entity Information [Line Items]    
Entity Registrant Name AA Mission Acquisition Corp.  
Entity Central Index Key 0002012964  
Entity File Number 001-42196  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code E9  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Shell Company true  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Incorporation, Date of Incorporation Feb. 09, 2024  
Entity Contact Personnel [Line Items]    
Entity Address, Address Line One 21 Waterway Avenue  
Entity Address, Address Line Two STE 300 #9732  
Entity Address, City or Town The Woodlands  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 77380  
Entity Phone Fax Numbers [Line Items]    
City Area Code 832  
Local Phone Number 336-8887  
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   43,974,000
Units, each consisting of one Class A ordinary share and one-half of one warrant    
Entity Listings [Line Items]    
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one-half of one warrant  
Trading Symbol AAM.U  
Security Exchange Name NYSE  
Class A ordinary shares, par value $0.0001 per share    
Entity Listings [Line Items]    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol AAM  
Security Exchange Name NYSE  
Warrants, each whole warrant entitles the holder thereof to purchase one Class A ordinary share at a price of $11.50 per share, exercisable 30 days after the completion of our initial business combination and will expire five years after the completion of our initial business combination or earlier upon redemption or our liquidation    
Entity Listings [Line Items]    
Title of 12(b) Security Warrants, each whole warrant entitles the holder thereof to purchase one Class A ordinary share  
Trading Symbol AAM.W  
Security Exchange Name NYSE