Rouge 1851/2 cancelled, so it looks like AC subbed a 787 in. Maybe this will calm posters who think AC isn't willing to sub mainline for Rouge in the event of mechanical issues...

How do you know C-GHQY was supposed to go to CPH? Even so AC 2152 arrived in YYZ at 19:23, so the delay couldn't be due to AC squeezing in the LAS turn. 1.5 hours is about right to quickly turn the 788.