Damage Inc. Pacific Squadron WWII/Aleutian Invasion

This portion of the game is practically un-winnable as you pilot a PBY against NUMEROUS ground targets. I have tried everything I can think of from going head to head to flying down the center of the numerous targets and letting the side gunners help out (so far that has been the best option) but giving me crates of supplies instead of bombs, I'm always sucking hind tit!!

ANY help here would be great!!

LH