<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by SPEEDBIRD:
thanks...but X issue is still bothering me. It only seems to appear after(to the right hand side of) other letters as if it has a numeric value....I'm confused! 
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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.