Actually Air Part three was easily one of the best eps of season one from a story and character standpoint and one of the most impressive in terms of production values. Keep it.
If you want to get rid of anything get rid of excess Rush episodes. Far too many of those.
No, it wasn't. Sure, there was some good interactions between Rush and Scott/Greer and Eli/Franklin and the dipshits, but the story was weak and uninteresting and Scott's pointless religious background makes me hate the character more than Air Part I and II did.
Oh, and Rush needs all those episodes because the writers keep trying to make him look like a villain.