Seat Availability: the dreaded Xed out calendar dates

Q. Every time I click on the date I want to depart on the Travelocity calendar, the date is suddenly Xed out and my fare isn't available on that date. I've tried several different dates and they all end up Xing out and being unavailable. If these fares aren't available, why do they bother showing up on the calendar at all?

A. The airlines have only set aside a limited number of seats per day for a given price. Some dates will always sell out before others. And the longer a sale goes on, the more dates become unavailable. It's kind of like getting to the mall early the Friday after Thanksgiving to grab all the great sales. The earlier you pounce, the better.