here. possibly it was a freezing cold morning so there's possibly an icing issue on the wing. maybe they were not de-iced or the iced was not picked up and the plane suffered an air dynamic stall of the wing, and the other possibility is an engine -- major engine problem. because we know the plane reached a speed of about 175 miles an hour where it lifted off. within seconds that went back to 140 miles an hour when all the data was lost. so the possibility of a significant? gen issue or a stall. but having said that any twin-engine aircraft is designed to take off with full payload on one? gen, so it can lose an engine on take off and still continue to fly satisfactorily, that's the