Canada Plane Crash Mystery: Runway Was Not Wet, No Wind - Then How Did Aircraft Flip Upside-Down?

A Delta Airlines plane flipped upon arrival at Toronto’s Pearson Airport and ended up on its roof Monday, injuring at least 17 people. “This is an active investigation. It's very early on. It's really important that we do not speculate. What we can say is the runway was dry and there was no crosswind conditions," Toronto Pearson fire chief Todd Aitken told reporters