Originally Posted by
salut0
Not exactly this question but related — can you upgrade a Basic Economy long-haul fare (eg. LHR-BOS) by paying for an airport upgrade at checkin from WT to WT+ or even WT straight to CW? (Not using Avios and not through MMB on the website).
You can AUP (airport upgrade) if any are available.
https://www.flyertalk.com/forum/brit...thread-25.html