Using AACombat tag
Minimal version: 1.08 SE
RP 1.08 SE allow you to set aircraft target to another flying unit.
You can create Air-To-Air combat using this tag.
Certainly, if you have fast mouse.
to activate this feature you should put AACombat tag in AircraftType
[ORCA] ... AACombat=yes ...
Also projectile must have AA=yes and Aircraft must to have Fighter=yes tag