I'm not 100% sure about the other bases but here in IAH CAL has a huge employee parking lot for CAL, XJT, CHQ and maybe even Colgan employees. When I started I was just issued a parking pass that you swipe to get in the lot and have never paid a dime for parking. Someone correct me if I'm wrong but I believe the same system is in place in CLE and EWR for CAL and affiliated employees.