Portal:Civil Aeronautics Board, Aircraft Accident Report: American Airlines Flight 28 (1943)
“ No specification of altitude levels should have been necessary to prevent an experienced pilot from bringing his aircraft deliberately into such close proximity to an airliner; and his action was not only in violation of ordinary good flying practice and common sense, but specifically in violation of the regulation (60.343) prohibiting the bringing of an aircraft in flight within 500 feet of another. ”
