@Carolina:
So, are aircraft in battles a single sortie or a series of sorties? If single, then how do they continue to be in the air for round after round of combat. If series of sorties, then why would AAA be first round only?
Planes fight in every round of combat as long as they live or until the attacker retreats.
AAA units fire only once, before the first round of combat. That’s the rules.