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First class seats for EUA come out of "F" class, which is a subset of "A" class. Such upgrades will be shown as "Xy" on your Onepass statement where "y" is replaced by the original fare class of your ticket. For example, if you are on a B fare, you would see, "XB." Elite Y-fare upgrades come from A class and can be manually processed by an agent at the time of booking and will be shown as "AU" on your Onepass statement.
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