v3.26.1
Cover
Aug. 11, 2026
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Aug. 11, 2026
Entity Registrant Name Firefly Aerospace Inc.
Central Index Key 0001860160
Amendment Flag false
Entity Information, Former Legal or Registered Name N/A
Entity Incorporation, State or Country Code DE
Entity File Number 001-42789
Entity Tax Identification Number 81-5194980
Entity Address, Address Line One 2203 Scottsdale Drive
Entity Address, City or Town Leander
Entity Address, State or Province TX
Entity Address, Postal Zip Code 78641
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
City Area Code 512
Local Phone Number 893-5570
Title of 12(b) Security Common stock, par value $0.0001 per share
Trading Symbol FLY
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false