Five airlines for me--three AQP, one that transitioned to AQP while I was there, and one non-AQP. As others have said, in my experience it depends on the airline and its assigned FAA overseers. I've seen AQP programs that are too liberal with the "train to proficiency" aspect, and I've seen AQP programs where the MVs had stricter rules than a traditional PC typically does. I've also seen non-AQP PC/PT/LOFT curricula that were every bit as useful as an AQP program is supposed to be. It just depends on who is in charge.