Added another variant with increased speed.

Added an extra version where the occupants are completely invinicible unless the aircraft is destroyed. The original version is changed so that the occupants are only killable through direct hits (so AA splash damage shouldn't be able to kill you, but don't count on it).

Changed health to 1500. Moved the prefab up a bit so it does not spawn underground.

Increased health from 800 to 1250. Decreased small arms damage from 0.2 to 0.18.

Created a new item.