I could be very wrong, but I have not yet experienced any noticeable influx of "new" players. I have seen new names, but from their actions and abilities, either they are returning players with new IDs or (hopefully the case) players from other sims that are seeing advantages in the online play of Aces High.
The 2 weeks FREE promotion, presently happens to be the best marketing tool for this particular market. If Aces High were somehow packaged with certain gaming equipment purchases, extending coupons worth full month's subscription, even for existing players who have found the need to replace or upgrade equipment, I believe they will have hit the bullseye for their premium target.
There will be those few xbox controller users, and extreme mouse users that would enjoy the game also, but those that have $$ invested in the equipment are more likely to put the effort in learning the essentials to become more than cannon fodder to the many veteran players.