Originally Posted by
SparseFlyer
Just thought I'd let you guys know that the EJ fare was upgradable for 9,000Y and posted as F with bonus to Aeroplan (Aug 7th).
Essentially all fares are upgradeable to Premium Class by paying the same-day, space-available upgrade fee.
Sidenote: Why do some agents say "F is full" and 30 seconds later another person sells you the fare no questions asked?
Because availability changes from moment to moment. On trunk routes especially, most Premium Class fares are changeable without fees so availability fluctuates right up until departure.