While interesting, I'm not sure what that has to do with attacking submarines. No one needs to speculate about aircraft effectiveness against submarines. 264 u-boats were sunk by ships. 250 u-boats were sunk by aircraft. That comparison alone shows that aircraft were quite effective against submarines.
http://www.uboat.net/fates/losses/cause.htm
http://www.uboat.net/fates/losses/index.html
Wouldn't this have been more appropriate in General Topics than in the forum dedicated to SH3 mods?