Yes , airplanes were used to help detect U-Boats such as the PBY Catalina which was a flying-boat used to provide the eyes of a convoy and air-sea rescue .
The use of the convoy system protecting merchant ships as they crossed the Atlantic , airplanes for reconnaissance , radar , depth charges .
They were German boats used in WWII.
People will always mention the "convoy system" of course; but that was strictly a defensive measure...not a killing measure. What killed subs was airplanes. If a sub could been seen, it could be killed. And subs almost always had to run upon the surface in order to breath. Escort carriers launched airplanes!
Convoy system
Sea Ray makes boats.
Airplanes dropping bombs and firing .50 caliber Browning machineguns were effective against German subs.
Automobiles, airplanes, boats.
Airplanes, boats
Escort Carriers. This brought airplanes into the killing grounds. Planes launched from carriers hunted down their prey.
german U-boats were submarines. in German they are called Unterseeboot
Trains, Boats and automobiles.
boats: Boote