1) Above ground level 2) Above-ground 3) Bad place to be hanging 4) Bad place to meet 5) Battle of britain arena 6) Between heaven and earth 7) During flight 8) First-person shooter 9) Happening in the sky 10) In the middle of the air 11) In the sky 12) In-flight 13) Kind of collision 14) Like some catches and crashes 
[n] - some point in the air
noun some point in the air; above ground level; `the planes collided in midair`