I'm not sure this qualifies as a "known benefit" . . . this sounds more like a classic "one-time exception".
Yes. You can also upgrade awards under UDU.
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So I assume this to mean, we should be automatically added to the UDU list when using a Y award? (Though Im unsure anyone would actually use miles on a domestic award anyway)
Here is an interesting one though: how about udu on top of instrument upgrades? IE, 3 class transcon, use CR-1 from Y->C, UDU from C->F ?