<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by TWA Guy:
What fare class is used for the 500-mile electronic upgrades and is availability shown in Galileo? Thanks.</font>
As noted above, it's "X" for domestic. However, for Mexico, Caribbean and (I think) 3 class domestic upgrades to 'business' class, it is "R".
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Not sure where I'm going, but I'm getting there fast.