<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by satish_ny:
If the X appears next to a letter for the fare class for example F9 A2 J9 D0 W2 TX Y0 B0 H0......etc, it means that the flight is closed for that fare class (in other words, it will not accept a request to waitlist in that fare class. In the above example, you will not be able to waitlist for "T" class.</font>
I though he meant X in the fare class, but yes, in inventory an X means CLOSED. W means waitlist.