Yesterday AC756 (SFO-YYZ) was cancelled after sitting on the tarmac for hours. The engines would not start after being pushed back. The captain explained it was no problem, they would have the maintenance crew come and do it manually, but several hours later parked back at the gate and repeated attempts to start the engines ended up with no luck. Flight was cancelled and we reached YYZ with a 10+ hour delay.
I am expecting the $1,000 compensation for this case - will report back.