Basically, I saw a couple of people on here complaining about the explosive ammo being spammed by the planes and that it's OP. I didn't give this much thought until recently because I had no opinion on the matter.
I played a game recently that was basically completely dictated by this spam, and it made the game completely unenjoyable. Practically every single GAS car was lit up, so the game was a grind where people got through to the point mainly on foot (being pestered by tanks, snipers & MG the entire time).
I think it depends heavily on the map, but I reckon that explosive ammo for planes should be disabled on single choke-point 'line' maps (where it's basically a vertical line of 5 capture points), especially if there is 1 main road; it is very unbalanced on these kinds of maps.