Originally Posted by SleepingDog
...It just seemed strange to me that the higher fare classes could sell out before the lower ones...
In theory this should not happen as the fare classes should disappear from the bottom going up as the flight fills. It depends upon the number of seats sold by either cabin (J and Y) and the 'velocity' at which the fare classes are filling.
What has thrown a wrench into this in the past ( about a year ago) is that Montie vowed that AC would offer the lowest fare on any city pair as compared to WestJet. This resulted in some strange things happening on select flights and select days.