Taking on those planes is a piece of cake!

Hit Flank speed, then man the flakguns and zig zag right to left every 20 seconds or so, ive outlived an attack of 5 B24's coming at me shot 2 down the other 3 came back for seconds and still missed - slight damage from gun fire but no heavy damage.
If you decide to attack on the surface just dont travel in a straight line. Zig Zag all the way. I haven't had the chance to try it yet using Greywolves, its mid 1941 in my career but im expecting to be sunk when i do:hmm: