Good tip is to use trident subs to take out as many AA gun emplacements as possible. For an air attack I use regular Bombers to take out remaining AA they can take them out in 1 shot and survive the flight back with little damage if u upgrade them right, then use NB to destroy enemy airfields, carriers, and capitals this will cripple the enemies Airforce and Economy at the same time. Then send a second wave and start hitting everything u can. At the same time I launch carrier planes and start hitting the coast with battleships and frigates so make an easier entrance for my sea borne troops.