I thought this plugin prevents shooting of the normal crate dropping CH47 and
only shoots such vehicles that have a player pilot in it? Am I wrong?
Well, the Sams do shoot the normal crate dropping Chinook.

It should not shoot ch47 with alltarget set to false

Oh ok. That is the problem.
But if I set it to false will Sams still shoot Chinooks with players in it?
I got the Vehicle License plugin and players are able to spawn Chinooks if they want.

I think alltarget must be true to shoot chinooks at all. Currently, it doesnt care about the kind of pilot (npc or player). Maybe there's room for another option to be added in the next patch.

This would be great and is exactly what I was searching for when I installed your plugin.
A plugin that lets Sams shoot Chinooks with players flying it but not the NPC ones.

Still SAMs attack the NPC chinook and lose a lot of ammo everytime it flys by. :(