Yes. I'm sick and tired when I'm the only person doing well on my team. I get a GunShip. But can I use it? No, because some pathetic noob going 4-17 runs and steals an enemy Care Package and gets an Attack Heli in the air. That stalls time getting MAYBE 1 kill, and then we lose before I can call in my GunShip because of the pathetic noobs on my team.
Similar things have happened to me atleast 10 times (when I got a Chopper/Gunship, and someone gets a heli, not allowing me to call mine in before the game ends).
It would be fun if you could have infinite air support at one time (like a Attack Heli, CG, and GunShip all in the air at once lol) But, the game probably will lag like hell with all that flyin s*** in the air.
I dont think there should be the ability to have more than 1 up at a time. I think that you should be able to call 1 in and just stack them so when 1 goes down another comes in.