Originally Posted by
Kmxu
Either SFO-LHR or LAX-LHR is more difficult for upgrade than EWR/IAD-LHR.
So, please specify which part of UA will OP fly to Europe.
I guess that IAD-AMS is also a good route for upgrade on midweek. IAD-FRA is, too.
thanks! Ewr but could do iad too