I'm not flying through CLT, and I don't often fly US Airways, but in my experience, outbound international flights don't necessarily leave from a terminal designated as International, unless they are foreign carriers and/or widebodies. On the return, yes, as customs and immigration checks are required. I'd be surprised if a flight to CZM didn't leave from a regular US Airways domestic terminal. Tomorrow, Wednesday, US1235 leaves from B8.
I don't know the security setup at CLT, but it might make it difficult to go into the international area for a meet-up, then head to a domestic gate for a flight. You should know what gate you are flying from on Thursday for a Saturday flight, should be plenty of time to decide on a place.
Excuse the horning in. As I say, I won't even be there, it's just my two cents, hoping to help avoid any mix-ups.