On Terminal you have the main plane where everyone goes to camp in the back or in the cockpit, outside the plane you have a orange truck with exploding barrels in it.

Go up the ladder on the back, look at the other plane wheel,s which are behind the fence, sprint and jump and you should land on the fence.

Then crouch and you should be able to get out of the map. Be aware you cannot get out unless you get shot and you cannot shoot out.

If you need me to demonstrate, add me CJ GOST1.