Originally Posted by
ORDtoAnywhere
Follow up - this happened to me... I couldn't check in, as it wanted to know how I'd be "paying" for the upgrade. Promptly demoted back to E+... c'est la vie.
Hope you at least got the same seat you had booked (or a better one since a lot elites would have vacated good seats after their upgrades cleared). I'd personally be very annoyed if I got stuck in a middle after all that.