Place a firearm in a container with hard sides that locks securely. The firearm has to be unloaded to be legal.
Tell security in the airport that you have a firearm. If you don't, you have the potential of being fined up to $10,000.
Lock the container containing your firearm securely, but provide an easy-to-open combination on the lock or a key so security can easily open it for inspection.
Stay near the security inspector so they can report directly back to you. If you wander off before they get back to you, they may not allow the container with your weapon on the airline due to your firearm container being unlocked.
Carry all ammunition in secure boxes made only of wood, metal or cardboard.
Pack ammunition or firearm parts in the same container containing your firearm. This is the most acceptable way of transporting additional parts to your personal weapon on an airline.
Use a firearm magazine as an acceptable alternate to carrying ammunition. However, TSA suggests you carry the magazine in a pouch or holster so it's covered. Exposed ammunition on an airline is illegal.