Precision challenges, airborn.

This challenge seems really hard, but it really is just where you are. to complete it, you have to get a two kill streak while in mid-air. there is an easy way to complete this challenge. start in a mode that you have unlimited respawns, like team deathmatch. try to get to the wasteland map. when the round starts, go into the cave, and to the corner with a few barrels. if you look down, there is a crate. if you stand on this crate, the computer is tricked into thinking you are in mid-air. get two kills, and your done.