I have an AC flight EWR YYZ next week (connecting from SAS into EWR) that was originally 1:41 long. It must have changed because it's now 1:29 long.
The flight is 48% on time, with an average delay of 56min.
I get the need to squueze more flights out of a plane by setting unrealistic block and turnaround times to make more money, but seriously.