Odd Air Canada flight

flightaware.com/live/flight/ACA1 … /CYYC/CYYC

This flight seems to have diverted and returned back to Calgary after having reached it’s destination, Vancouver. Seems strange. I’m curious if anyone has any opinions or facts about this flight?

I should add that on the previous day, the flight left Toronto on it’s way to Vancouver only to be diverted to Calgary! It seems like the flight is having difficulty landing in Vancouver.

I just listened to YVR ATC, the flight couldn’t land the second time due to heavy fog at Vancouver (they were below company minimums) so they returned to Calgary.