Originally Posted by wimpypipsqueak
Everything worked out fine. They did charge the extra (at least it is reflected in the e-ticket receipt I asked for when I checked in. Was a bit of an anticlimax really

Glad it worked out! ^
In my experience, if you buy the ticket from UA or United.com, then it's not problem. However, if you buy from a TA or other source, then your are
specifically instructed
NOT to get upgraded before the 016 is issued. YMMV, but it makes sense to me.