Like previous Ace Combat games, Ace Combat 6 features an enemy ace squadron that appears as an antagonist throughout the game. Estovakia's Strigon Squadron fulfills this role, fighting the player in over a third of the game's missions. Individual aces also appear in each mission; shooting them down unlocks their aircraft's special paint scheme.
ESM support can be employed by both allied and enemy forces. ESM greatly enhances the tracking ability of guided weapons, even ordinary missiles. It also reduces the tracking ability of enemy weapons. ESM is different from jamming since it doesn't entirely prevent affected units from spotting their targets through radar and their lock-on capability is not as severely hindered.
Multiple ESM fields can overlap each other for stronger effects. Having an allied ESM field over an enemy ESM signal doesn't negate each other but the effects are still experienced by units from both sides within the field's effective range.
Frontline resupply is another feature in the game where players can land in friendly airbases to resupply, in the middle of the battle.