I aced 1945, piece of cake. To take out the balloons easily, do this: position ALL of your planes after one balloon (spotter). With 4 planes you can take em down in one run, so they can't even shoot at you when you fly over them. Then just do the same with the behemoth, go behind it and make turns that allows you to shoot in the start, and flies away to safety later. Get back easily with the 180° turns