There are some commonly-used abbreviations to mean whether you're attacking from air/ground against air/ground. These include:

  • A2A - an air-to-air in a warhawk killing another warhawk with missiles
  • A2G - an air-to-ground in a warhawk killing troops or a tank with a TOW
  • G2A - a ground-to-air in troops shooting warhawks with RPGs or turrets