<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by ScottC:
OK, I found it:
X is a Part of day/week code that follows the "prime fare code", it means it's a midweek ticket when midweek/weekend fare rules apply to the prime fare code.

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what about the mysterious "G" class?
Is I class good for full points and miles?