Air Transit flight to YYZ left at 03.00. A replacement A330.
The other Air Transit A330 with burst tyre and damage to wing departed form hangar 6 at 03.30 for SNN.
Incident: Air Transat A333 at Toronto on Jul 15th 2011, tyre and wing damage on takeoff
Crew thought it was a bird strike.
AAIU investigator was sent to airport but Canada's Transportation Safety Board will investigate.