You kind of missed his point. It's not where you fly that makes you a regional, it's who decides where to fly. AirTran may not fly internationally, but management and marketing determine the destinations. I fly internationally, but it is mainline that decides those destinations, not my management or marketing (the latter of which does not even exist at a regional airline). So yes, AirTran is mainline because no one else controlls their flying. And yes, I am a regional pilot who wishes mainline had never farmed out nearly 50% of their flying, be it on a jet or not.
Well said.