Just wanting to understand your idea Juggler. You are saying that any aircraft not on the free, base list would have to each be purchased individually or all extra aircraft are purchased at once like buying a premium package of the game. Also would this be a one time only payment or would it be an additional monthly payment on top of the $14.95 most players pay now?
Personally I wouldn't pay for extra aircraft every month and would have probably not ever signed up for AH in the first place if that was how it was run. (but that's just me) I also would not spend any extra money to add a newly introduced aircraft to my line up. The way it is now with the perk setup, everybody has at least a small chance to work hard and earn enough perks to fly that aircraft they have been drooling over in more than just offline or in the TA, DA. If new or high performance AC were only made available through extra money payments (one time or monthly) there would be a lot of people who would feel ignored, slighted, or just plain excluded from a part of the game simply because they won't or can't make the extra payment.
PJ - I agree that this method would help to bring in a certain clientele, but I also think that it wouldn't necessarily be a more mature clientele. The way I see it is the squeakers and immature players are the ones spending their parents money to play this game and are more likely to be able to get more of that money to buy the uber rides. It also seems to me that a lot of the immature players are also the ones concerned the most about score and will be more willing to spend that extra money for the higher performance aircraft.
In summary, I think this would do more to decrease the amount of profit HTC would receive over a longer period of time vs the current way things are implemented. Please don't take this as trying to be a jerk or trolling, I am just playing devils advocate and would really like to hear the answers to my questions above and any counter points people can make as well.