Certain emblems have the ability to do so. The Phoenix emblem from the first tourney turns it red, and the Guitar Nugget emblem from the promo code that came with Ace Combat Infinity & Series Music Best turns it yellow, though it is Japanese exclusive so far.
So that's the only way to change the contrail color in Infinity eh, thanks mate.
Question solved.
Requesting lockage
TheTLMguy, I can handle it myself, thanks :P
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