we've talked about a points system. there have been talks about reserving aircraft.
I guess the ideas depend on how much gametime you feel each player should have to put into the game to be competitive.
if you view it as WoW = the more you play the faster you reach a higher level provided you're at a proficiency level to make the grades.
if you want to model it so that strategy matters more than gametime. Which to me, given the "real time" feel the game has, would make more sense than having to sit and monitor the used market all the time.
IMHO, the strategy you go for should have a greater impact on the game than your eager to monitor the used market. Having X amount of USED AC you can bid on, or a quota of X amount of AC in each class, or X amount of AC based on points would allow you to get whatever equipment you want.
And I'd rather play many players with them having a chance of getting AC to fly, than to compete against a few really good players.