A Transportation Safety Board investigator says an Air Canada plane landed so significantly short of the runway in Halifax that it hit a power line and knocked out power at the airport.

The Airbus 320 landed 1,100 feet short of the runway during a Sunday morning snowstorm. It crashed into a bank of antennas and sheared off its main landing gear, nose cone and an engine before skidding on its belly. Twenty-five people were taken to the hospital and all but one has been released.

Mike Cunningham, the lead investigator, said in an interview Monday that they're still trying to determine why Flight AC624 landed prematurely.