operating or directed from a flying aircraft to the surface: air-to-surface missiles.
from a flying aircraft to the surface of the earth: They released the rockets air-to-surface.
Origin of air-to-surface
First recorded in 1955–60
Also called air-to-ground [air-tuh-ground] /ˈɛər təˈgraʊnd/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019