Investigators probing Monday's Delta plane crash at Toronto Pearson International Airport are piecing together what caused the dramatic incident.

Images of the Delta CRJ-900 show the airplane on its back on a snow-covered airfield with a fire truck spraying down the tail section. Black smoke appears to be rising from the inverted aircraft.

Endeavor Air, based in Minneapolis, is a subsidiary of Delta Air Lines and the world’s largest operator of CRJ-900 aircraft. The airline operates 130 regional jets on 700 daily flights to over ...