WordNet (r) 3.0 (2006):

airburst
    n 1: an explosion in the atmosphere

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "airburst":
   altitude peak, automatic control, blast-off, burn, burnout,
   ceiling, descent, end of burning, flight, ignition, impact, launch,
   lift-off, rocket launching, shoot, shot, trajectory,
   velocity peak