Actually, I'm pretty sure it's an i, not an L.. "AI" stands for Air Interdiction, when discussing air attacks in the military.. AI is more of a helping hand to kind of slow our enemies down in aiding our ground troops, vs an air campaign where we try and win the whole battle/fight by using air strikes alone to win..
Good catch though.. I never noticed that.. It's the same way in public match create-a-class as well.. I always assumed it said All.. But it does make sense to be A i, because the Blind Eye perk doesn't protect you from player controlled air attacks- dragonfire, Vtol, Lstar..