I don't know if the flight model changed, but in the version I had, I was able to fly it around pretty well, even landing on buildings (including the airfield tower) and flying under bridges. The problem I had was I got used to hiding behind trees and popping up to strike, and in the version I had, the trees had no affect on the AI. That meant if I were hiding behind the trees, I couldn't see anything, but AI enemy units could see me just fine, and their weapons passed right through the trees and hit me, so it was a little frustrating. I had been flying Gunship!, and it has collidable trees that would block weapons, and had gotten used to that and I had a hard time adapting to Black Shark.