Mileage Upgrade on Paid Int'l U Fare?
I'm trying to decipher the DL mileage upgrade award charts.
I'm considering buying a DL ticket from DTW-HKG on a U Fare, then upgrading with miles.
Can I do this? I thought U was a nonupgradable fare, but the chart doesn't note it clearly. Based on my read of the chart, I'll be looking at 25k miles each way for a single-class upgrade (Coach-->Business)....
Thoughts?