Police are looking into the apparent midair collision of Delta 's captain . Data and voice recorders given to investigators . Federal law : Recorders must tape conversations on flights made since 1991 . The co - pilot 's statement says he would not consider himself a hero .
Investigators are looking into the apparent midair meltdown of flight 's captain . Data and voice recorders given to NTSB . Federal regulations : Recorders must tape conversations on planes made since 1991 . The co-pilot 's mother says he would not consider himself a hero .