Originally Posted by
bver100
So I was picking seats today for my ORD-AMS UA908 (3/20), and was able to pick 23b. Now, these tickets were purchased from expedia, and it's marked as fare class S on the UA itinerary site. I looked this up in the handy booking codes thread:
Expedia will let you put yourself in E+ if you check some box somewhere that says your status entitles you to preferred seating or something like that. However, you will be almost certainly be reassigned an E- seat once UA does a sweep.