Yeah, May 9, 1945 was four days after the German surrender, and my understanding (from study and various accounts) was that the Germans were doing everything possible to surrender to the Americans rather than to the Russians.
So, how long has those Stukas been flying around looking for an American a/c to surrender to? if they'd just flown to an American base, the odds were probably pretty good that they'd have been shot down? Officially, lowering your landing gear in the presence of 'the enemy' was a sign of surrender, but Stukas are fixed gear, so....
Just my thoughts.