I read a book years ago about U-124, the “Edelweiss” boat.
I recall the captain’s favorite hunting grounds was the Gulf of Mexico between New Orleans and Panama City. I wonder if his was the other boat sighted?
Read this: http://uboat.net/books/item/468
“Operation Drumbeat” by Micheal Gannon, a Florida native and history professor. U-124 plays a prominent part, and was involved in attacks off the coast of Florida, some with gunfire at night. I do not recall reading that U-124 was ever attacked by an aircraft. It did have one close encounter with a Q-ship - which ended the U.S. use of Q-ships after U-124 promptly sunk it. U-124 entered New York Harbor early in the war, as well. Employed in greater numbers, without that idiotic enigma and radioing home every night, the U-boats might have changed the course of the war.