Quite the full flight today on the daily YYZ-SFO - I counted about 6 empty seats.
At the main Porter check in counters at YYZ they made multiple calls for those in line travelling to LAX and SFO at 7:45am and brought them out of line to a dedicated counter, presumably to make sure they were checked in and had bags checked before check in closed.
The buy on board was quite popular, from what I saw quite a few passengers didn't get their first choice of meals.
What I found interesting: multiple OTAs selling this flight quite cheap compared to booking direct - something like $500 vs $300 one way. Just checked the prices for a one-way on Wednesday - $465 direct from Porter, $205 from Air Transat, and ~$200 from a bunch of OTAs.