The Globe and Mail reports in its Wednesday edition that U.S. safety investigators are looking at whether factors such as staffing, fatigue and communication failures played roles in the fatal collision between an Air Canada Express passenger jet and a fire truck on the runway at New York's LaGuardia Airport on Sunday night. The Globe's Eric Atkins and Maura Forrest write that Canadian pilots of the plane died when the Air Canada Express CRJ 900 carrying 72 passengers and four crew from Montreal struck the emergency vehicle. The flight was operated by Jazz Aviation, a contractor to Air Canada. At a press conference, Jennifer Homendy, chair of the U.S. National Transportation Safety Board, said the first stages of the investigation found the fire truck did not have a transponder that would have made it visible in the control tower; a radio message from a vehicle to the tower shortly before the fatal crash was indecipherable because it was "stepped on" by another radio user; and the two air traffic controllers on duty were working a midnight shift and performing the jobs of others. "When something goes wrong, that means many, many things went wrong," Ms. Homendy said. The controllers stayed working after the crash.