Flying with a firearm

Federal TSA rules + the airline-specific declaration process for the 8 US majors + state gotchas you have to know.

⚠ Critical: Use a NON-TSA lock on your firearm case. By federal law (49 CFR §1540.111), only YOU may have the key/combination — using a TSA-approved master-key lock disqualifies the case. If TSA needs to inspect, they'll page you to come unlock it.

🇺🇸 Federal TSA rules — apply to every airline

Firearms must travel in checked baggage only. Never carry-on.
Must be unloaded.
Must be in a hard-sided, lockable case — your case, not your suitcase. You can put the firearm case inside a checked suitcase.
Declare at the airline check-in counter, not at TSA. Use the word "firearm." You'll sign a declaration tag that goes inside the case.
Ammunition: in original manufacturer packaging or a fiber/wood/metal box designed to carry ammo. Loose rounds and stripper clips are NOT acceptable. Ammo can go inside the firearm case or a separate checked bag.
Magazines: empty mags can go in carry-on; loaded mags must be in checked, in proper packaging.
Replicas, BB guns, airsoft, paintball: same checked-bag rules as real firearms.
Parts (slides, barrels, scopes): generally OK in carry-on EXCEPT magazines, which must be checked.
Suppressors / silencers: checked only, declared as a firearm.
Black powder, primers, gunpowder: banned on commercial flights, cabin and hold.

Pick your airline for the declaration process

Destination state — quick lookup (all 50 + DC)

Carry-permit type, magazine-capacity limit, and FOPA transit notes for every US state. Use this before booking a flight that includes a layover or overnight stop in a strict state.

🗺 State gotchas — destinations with extra requirements

Hawaii (HNL, OGG, LIH, KOA) State law requires you to register every firearm with HPD within 5 days of arrival. Bring proof of ownership (purchase receipts, prior registration). The Honolulu Police Firearms Section is in the basement of HPD HQ; appointments recommended.

New York (JFK, LGA, EWR) Federal Firearms Owners' Protection Act (FOPA) protects you in transit — but if you stop overnight or your luggage is delayed in NY, you may face state charges. Get your bag onto the connecting flight, and avoid overnight stops with the firearm if possible.

Washington DC (DCA, IAD) DC firearm registration is mandatory for anyone with a handgun in the district. Transit through DCA is federally protected, but stopovers, hotel stays or rental car storage triggers DC law. DCA on federal land = even fewer exceptions.

Chicago (ORD, MDW) Illinois requires a FOID card to possess firearms in the state — federally pre-empted for in-transit travel but ATF inspections happen at ORD/MDW. Have your purchase paperwork and your FOID (if you have one) accessible.

California (LAX, SFO, SAN, etc.) Magazines over 10 rounds are illegal in CA, including for travelers in transit. Federal FOPA protects you on transit but California prosecutors have charged in some stopover cases. Keep mags <10 rds or fly direct.

Massachusetts (BOS) MA has strict firearm laws. FOPA protects in-transit possession but MA State Police have prosecuted travelers with non-MA-compliant magazines (10+ rounds) or "assault weapons" (state-defined). Fly direct if possible.

📚 Sources + cross-links

Federal law: ATF Firearms FAQ ↗ · FOPA — 18 U.S.C. §926A ↗ · TSA — Transporting Firearms and Ammunition ↗

State-by-state firearm law references used for the quick-lookup above: USCCA State Reciprocity Map ↗ · NRA-ILA State Gun Laws ↗ · Giffords Law Center ↗ (three perspectives — cross-reference for current accuracy).

Related on this site: you'll need REAL ID or a TSA-accepted alternative to declare at check-in. If your flight is cancelled and you're checked-in with a firearm, see DOT refund rights — refund rules apply equally to firearm-checked tickets.

⚠️ This page summarises TSA rules + airline policies + key state firearm laws as of May 2026. It is not legal advice. Federal Firearm Owner Protection Act (18 U.S.C. §926A) provides transit protection but does not override all state laws in every circumstance. Always check both the airline's current policy AND the destination state's firearm code before flying. When in doubt, consult an attorney specialising in firearms law.