No, you don't always have the option. Most airports have the TSA screening in a public area but a number only have it behind closed doors. If you were to search this site for similar threads, you could pull together a list of major airports that only do TSA screening in the back room. San Jose, CA and Philidelphia, PA are two that I recall from past threads.You always have the option - I have flown all over the country with my rifle, maybe 50 or so flights and have never used a TSA approved lock on my gun case. Get to the airport 20 min early if you think you need to - well worth it. I have never had them inspect it behind closed doors. I have always been there and been able to watch them do it.