Sound aren't played while piloting aircrafts. I have checked the files, they're all present...
Could be since an update, but couldn't tell which one.
Console says :
CSoundEmitterSystemBase::AddSound( 'wac.wac_pl_c172.MissileAlert', 'scripts/sounds/lua.txt', ... ), script file not list in manifest 'scripts/game_sounds_manifest.txt'
for each sound related to the aircraft model.

Anyone knows how to fix/hotfix it ? Probable incompatibility issue ?