Originally Posted by evdog19
Also, Air Canada sometimes "moves inventory" from J to Y, allowing them to sell more Hospitality tickets, when they think that might be better from a revenue standpoint. They will then on move people from Y to J via upgrades, or op-ups.
That does not make lots of sense.
They sell more economy, yes. And they will give opups if needed.
But that does not mean that they would cut the number of seats available in J in order to sell more in Y. Indeed, they can list the available seats in both categories, and sell them as either, until the plane fills up.
J0 means it's fully booked in J. J1 means it's all booked (but not necessarily allocated) except for one seat.
Plus, we know that AC does not overbook J.