Good advice so far. I'll add: use so-called "TSA" locks on your rifle case or on any luggage that contains a gun case (a TSA lock is one that the TSA agents can open with a special key, but which otherwise operates as a conventional combination padlock.) Saves the TSA agents just breaking your conventional lock to inspect the baggage contents, and also has a little flag to let you know the lock's been opened. After subjecting your baggage to "inspection" by an overzealous, unqualified ticket counter clerk (a potential backstop, when no other safe one exists...) in front of God and everybody who will meet your baggage at the carousel several minutes before you get there to claim it, I suggest you volunteer to follow it to the TSA screening point, and be prepared to open the locks, manipulate the weapon, etc., to assure them that you can't use it to any bad end, or any end, once it's consigned to the cargo hold... My recent unpleasant experience of luggage gone missing with a gun inside came to a relieving end because I had slipped a business card into the provided pocket on my large carry-all luggage. I learned from this unhappy experience to affix on the exterior of my luggage a tag with contact phone numbers/dates for my complete itinenerary. No need to reveal addresses, etc., simply: May x-xx, 765-456-0987. Anybody alert finds your bag can contact you to route it to you --- otherwise, it's in limbo... You will from check-in on to be dealing with people of low skills, poor training, little concern, limited ability to deal with a vast, indifferent bureaucracy. The more you can do to idiot-proof the procedure will eventually accrue to your benefit.