The last time I left the country was when I was 17 and needless to say, I need some updates on customs procedures.

My fiance, myself and my 73 year old father in-law are traveling together.

We fly from STL-ATL. We are supposed to have a little over 1 hour layover, which scares me to death, since I believe you go through customs in ATL. Is this true?

Is there anything I can do ahead of time to make this process simpler, quicker? I'm afraid we will miss our flight to MBJ

I don't care about the way back, as we have more time, but I don't want to have any chance we miss our flight to MBJ with our short layover.