Why can't you fully unlock stuff through single-player?

[tbtstt]

Bit late on this thread, but I'm in complete agreement, I actually started a thread requesting all the aircraft be unlocked for training mode last week.

It wouldn't change anything for those who game online (and the Trophy can be left for online unlocks if desired), but for those of us who prefer to play the game offline using the traning mode it means we can access everything.