Maybe to point out that the number of seats in a fare bucket doesn't need to change at any second for the displayed fare to change. For most airlines, the fare

Maybe to point out that the number of seats in a fare bucket doesn't need to change at any second for the displayed fare to change. For most airlines, the fare buckets are not independent and bookings in one bucket may decrease availability from other buckets. These formulas make it unnecessary to change the number of seats allocated to each bucket all the time. Most changes you see during the day are just the result of new bookings and cancellations that are coming in live. The volume of pre departure cancellations can be crazy for some routes to a point people wouldn't even believe.