Best AA shell?

[Germany!]

so I just unlocked everything for the flakpanzer I and was just wondering if there was any particular shell that was extremely effective against air craft? I know that the vehicle is supposed to be good against aircraft but it feels like Pzg 40 overpenetrates and doesn't cause the aircraft to go into a fireball when I hit the fuel tank or is it just me?

[Probably Lime]

HE/HEFI. Anything that explodes. Planes generally aren't well armored, so you want as much 'boom' as possible.

API/APHE follow the regular explosives.

Regular AP and ball are mostly useful for turret gunners, since they can punch through components and glass to hit the squishy meat part of the plane. They're still useful in super-high rate of fire guns like the ShVAK, though, since you can pretty much saw the enemy's wing off. And in planes with tons of guns, too. The US M2 AP round is pretty good against everything as well.

AIA is basically a tracer that goes off once you hit a target. As far as I can tell they don't do much damage at all.

[Tankfriend]

As Lime said, any HE-type ammo, because aircraft don't have enough armour to protect themselves against it well.

The AP / APCR ammo is mainly there to be used against ground targets.