This is one of the harder achievements because you have to get a kill in the plane. First in the car, either run someone over or shoot them with the machine gun on top of the car. In the tank, either run someone over or shoot at them with the coax gun or barrel. The plane kill can be considered either the bombing raid or fighter plane. If you use the bombing raid, which is easier for people who can not fly, just hit an area where there are many enemies. In the fighter jet, kill an enemy plane or drop a bomb on the enemy. This does not all need to be done in one round.