Originally Posted by
RSSrsvp
There is always the possibility that the flight that you want is sold out in the class of service you are trying to purchase. @:-)
It's not just a fare class that disappears-- it's the whole flight. I could understand if the flight I want changes from a T fare to a Y fare, but at least it still would come up as a possibility. I find it very hard to believe that so many flights get sold out and then become un-sold out every few hours or so.
Sometimes the number of flight possibilities on a given trip will fluctuate between 5 and 15 flights within an hour of searching.