Well I can understand the instinct of life preserving of the pilots.
BUT some chopers should be MORE RESISTANT to small fire arms like Apaches, Supercobras and other gunship of that sort. I can remember that in the initial version of Steel panther2 (1997) helicopters could fight after taking substentials damages (more than one point) so MAYBE if some let say experienced crews(veterans and elites) of gunships success in a rally check maybe then those helicopters could continue the fight. In my humble opinion most of the players would agree to my point of view. After all its very frustrating to have nice killing birds and see them turn their bleeding noses toward mother base to seek shelter...
Cheers
Vincent