Yes , i had the same problem.
Installed it with the latest ModMan version.
Started it , went to the editor , chose the Alpha Jet, put it on player,
hitting Fly , loading, went back to Fly Again.Never saw the Alpha Jet in game.
Tried other airplanes too;same thing.
I tried different installs , clean FC2, FC2 with other MODS, all nada.
No ADA MOD 2 for me.......:(