Originally Posted by
KLouis
Copa uses a different terminal than all US airlines. Thus, if your travel from PTY to IAH involves a combination of Copa and a second, American carrier, you'll have to change terminals at CUN: No fun, definitely! The same may apply for MEX to, but I don't know for certain.
The thread for MEX shows there are two terminals there - the original on one side of the field, and a new terminal on the other side, connected by a train. MEX is to be completely redone at some point; AFAIK there are no plans for CUN.