Originally Posted by coolcoil

The transfer is just like it would be in a USA domestic airport. You do not claim your bags and do not go through immigration and customs. You only go through immigration if you want to leave the airport.

When you get off the plane, you will see signs pointing to immigration. Don't follow them.

On the plane to PTY, the FA's will come around with immigration forms and will ask if you final destination is PTY. When you answer "no," they don't give you the form.