Friend of mine just did YUL-YYZ-SCL on 427/92 last week.

YUL-YYZ on 427 the 24th operated a couple hours late so he missed the connection and got put in a hotel, then had a day to see YYZ, which he didn't really mind so much.

92 is almost always a little late out of YYZ - it's scheduled for 23:30 but gets off at 00:30 give or take a bit - but my friend told me that on the 25th, er, early morning of the 26th, they got everyone aboard, and then a suitcase fell on an FA's head! so they de-boarded a half-dozen pax (due to being short crew?), which cost them another hour.

(Apparently they tried to get him to be one of the half-dozen, but he told them he was already a day late...)

Hope the FA is okay! Of all the luck!