11 in 109G10.. thats what I remember for sure.
and around 17 in Fw190A8..
In both, half were aerial kills and half were air to ground kills.
in 109G10 probably best air to air combat kills were 9 kills (1x20mm, 2x13mm)
(sometimes I've been very accurate in 109.. like 10 20mm shots per kill

)
In FW190a8 its in the same class for pure aerial kills.
In b17 I've killed over 11 in one sortie.. I were strafing a field during my grand streak without deaths and the guy quit coming up as I had just ran out of ammo from most improtant guns - so I got home.
I remember his name too, still.
those were before any land & rearm stuffs in the game..
in FW190A8, streak from all flights without death, is 278.