It says it was the flak cannon,but you know that killing tanks is weird sometimes,like seeing seeing insert gamer tag here destroy KV1 (L-11) with kar 98(d) but I couldn’t find a good way to link it better than this,bit just scroll down a bit and find the clip called the most epic thing ever,and if the link doesn’t work let me know I’ll try to fix it
https://account.xbox.com/en-us/profile?gamertag=GasMasters
Last thing to damage it counts as the kill for aircraft. For tanks if you kill the crew, even while outside the tank, will blow up the tank after a while and count the weapon used to kill the crew to show as the weapon killing the tank.
I’ve “killed” a tank once with a Mannlicher that way.
I’ve also had kills on aircraft with M1 Carbines and SMG’s. Also with aircraft dropped bombs but those probably actually did kill it.