coast. investigators are combing through the wreckage of the fiery plane crash in alabama. the plane broke apart on impact. e we also learned there was no distress call before the crash. what e we do not know may be most important. why did this happen? here's david math. ingly with the latest. >> there was no distress call from the pilots. >> reporter: federal crash vergs will count on witnesses to recreate the flight crashing just short of birmingham's airport. one story emerging from people who heard it it. possible mechanical problems. >> it was extremely low. then it sounded like it was sputtering, like it was out of fuel. >> the recovery of the voice and