Update on Terminal C from recent return experience: We flew to MCO with Southwest, so pick-up at A or B was as always. Leaving with LH to FRA on Monday from Term. C was not terrific. Returns for C are done, at least now, at Terminal B returns (missed the sign saying this and drove up to C, so we had to circle again back to B). After returning at B, you need to cross back over to the main terminal and go to level 1, then to shuttle bays 28/29 and wait for a shuttle back to C to check-in for your flight. Shuttles for 8 PAX go every few minutes - supposedly - but, with approx. 40 people waiting on a Monday afternoon, it did take quite a while (Friday or Sunday probably a lot worse). We were told that they also use a large bus to shuttle, but none came while we were waiting. Might be better when returning a car to check-in with your luggage at C, and then return the car to B (having only your hand luggage in the shuttle back). Allow more time than you usually would!

On the positive side: Since there are still so few flights going out of C, the time to get through security was only about 3 or 4 minutes. Again, info for a Monday afternoon.