Status Report 2: If I am reading these posts correctly, here are the leaders in fighter kills after only ONE sortie (NO rearm, NO refuel, landing the kills, no ditches, no chutes, against only fighters airborne and able to defend themselves):
Manedew, Me262, 28
mrod (rod367th), Nik, 24
Octavius, F4U-1C, 18
Yucca, Bf109G2, "17 or 18"
WldThing, P-51 (D or B?), 17
HeLLcAt, P-51D, 15
Nomak, P-38, 15
Dead Man Flying, Spit V, 14
Grunherz, Bf109G10, 13
Wadke, P-38, 13
LLv34_Camouflage, Bf109G2 (3x20mm), 12
Nilsen10, P-47D25, 12
Roscoroo, P-47D11, 12
GScholz, Ta-152, 11
Tarmac, 190A5, 10
These 15 are the only pilots so far reporting 10 or more kills, and only their highest single total score is mentioned (some also have other sorties above 10). Bf109s take the lead with three among the leaders. Let me know any corrections needed.