I wonder....”planes” or a blimp ? At that period of the war the USN used a lot of blimps for long-range patrol convoy escort work in that part of the world. >PS
On 19 July 1943, LTjg Roy S. Whitcomb flying a PBM-3C “Mariner” dropped six depth charges that sank U-513. Whitcomb saw 15-20 survivors in the water after the sinking and dropped some life belts and rafts to them. BARNEGAT eventually picked up the survivors the next day.