Originally Posted by
canadiancow
While that is sometimes true, it is not always true.
A lot of the cheaper P fares book into M for single-cabin aircraft.
On Sunday, I booked YYG-YHZ-YUL-YQB on a P fare. The fare classes were M P M.
This was my experience too. Booked P fare YYJ-YVR-YYC, and YYJ-YVR booked into M, not Y/B. So OP, you will likely only get 100% for YYJ-YVR.