Couple months ago I rode AWAC from IND-BOS. Gate agent announced that the wheels up time wasn't for another 3 hours, so I just figured that we'd hang around the terminal and eventually board. But no, CA actually requested for the agent to board the plane. CA explained we'd go out to the end of 23L, shut 'em down, and sit there hoping that someone would miss their slot and we'd be able to pick it up by being ready to go. Sounded like kind of a gamble to me, but low and behold after about 1.5 hrs, we had the engines running and were out of there. Question is, who's decision is this? Obviously the extra effort by the AWAC crew was highly appreciated (saved +1.5 hrs) but was that solely CA's decision? Anyone out there ever done anything like this?