In case it hasn't been said, jetpacks are slower. Yes, only a little, but they are and they can't be enhanced to increase speed or to reduce Endurance cost if you plan on fighting in the air. And on top of that, the rocket board, void skiff, and flying carpets negate all other powers (even toggles which don't have to be animated to be useful instead of just putting the character into a Only Affecting Self state).
Leave the various flight temp powers alone. Actual flight powers (Flight and Sorcery pools) are superior.