You can get a CDL for a career-related course. So I guess it depends on what course you are doing and how good you are at bulls*itting.. .As mentioned, I am not suggesting doing a full time course whilst working, only a part-time distance learning type course. Usually its impossible to get the same day off each week, so an evening course probably wouldn't work.. .Some Uni's offer modular courses that fit in well with airline work.