Can you use UA miles to upgrade UA codeshare on LX metal?
A friend is buying a discounted Y ticket SFO-ATH-SFO for a trip in September.
She has plenty of UA miles but of course there are no awards available now.
She can buy the ticket on LH or the same flight on a UA codeshare. Will there be any chance to upgrade at check in using UA miles? Or will the fact that the original booking is some discounted fare make her ineligible no matter how she books it?
Sorry if this belongs in the UA forum.