I'm sitting on the tarmac at YYC. Pilot says there is a mechanical problem and they are "looking for a spare part." Doesn't sound too promising.

What's the procedure in case the flight is cancelled? The pilot said they would try to get another plane but I'm worried about how long that would take. Also, we're on a B767, which is larger than the usual A320s that fly YYC-YYZ. What are the chances they can find another large plane on short notice?