What about 1 free plane, but wait,...... to stop others cancelling their sub you can only go in the MA for say 45mins a day without a sub.... this enables them to get better, get hooked and also gives others in the MA a bit more action. It also gives newbies a chance to make friends and find helpers who persuade them to join.... win win.
(dare i suggest this as not being a sub myself?, but i cant justify it at the moment, but if i was allowed even a crap plane for 45mins i would occasionally give you guys some bait and a spirited fight!) 
I loved my free trial but i was useless, however i have improved vastly just from non paid arenas but i would love some MA action!
Actually a pretty good idea!
Anything to keep players in the MA fighting.
We were all garbage during the first 2 weeks. I got 1 kill in about 30 sorties.
Pretty much the only reason I stayed was because of H2H allowing me to learn the game on a smaller level. When it closed down, I was forced to purchase the subscription, but I did because I was better at the game, understood it better, and could hold my own a little better. I honestly did not like the far away bases at the time being 25 miles. (My biggest gripe). I still sucked in the MA for a while until I joined a squad that changed my abilities 10x. The MA is a very tough place. With only 2 weeks, it's like putting 1 lamb into a pit of alligators all trying to eat it. With no where else to go but the MA, it makes subscribing a tough disision.
WOW, an Idea I can not remember hearing before. X minutes free time a day.
HiTech
I think you should try it. The more people we have in the game fighting, the more will come back and subscribe due to bigger fights. It's a chain reaction. More fighters equal more fights which equals more players playing for the bigger fights.