I traveled from DC toSacremento and then toLas Vegasand then then to San Francisco last December with two GLOCKs. I left from BWI. FOPA protects you in the interstate transport notwithstanding Maryland's totally screwy law. Follow FOPA exactly and have a copy of the law with you will in Maryland. I used a locked hard sided pistol case inside my softsided luggage. I did carry a small amount of ammo, but not in the pistol case. Airlines allow 11 pounds (5 kilos) butI have never had them weigh my ammo. Have not flown Southwest out of BWI. I think I flew American on the outbound trip. Be advised that TSA is not on the same level where you will check your bag. I was very concerned about that because TSA is not authorized to open your bag if you declare a firearm without you being present. I do understand you can ask for a TSA agent to conduct an inspection in your presence of the bag. There may be some grumbling about that by the airline or TSA. In my case I stood around for over 1/2 hour at baggage check to make sure there was no issue. Dulles and Reagan are so much better when flying with firearms since airline personnel will hand carry your luggage to TSA with you present to conduct the inspection. Have not flown into or out of Florida with a firearm.