Moderator: Midwest, Las Vegas & Dining Buzz
Join Date: Jun 2001
Location: Chicago, Illinois
Posts: 17,981
I do "A" from ORD-LHR on the 767 many times throughout the year.
Never been an issue getting a F seat (unless there is none available). Never had an issue with a seat changing on me either.
However, I never do it on-line and just call the GS desk to do it for me.