Our original booking was for two exit-row seats on the side. About 48 hrs. before the flight, United switched planes and placed us in exit-row seats with three abreast. The computer also assigned us the window and middle seats, which seemed small and cramped for economy-plus fares. We wish that United would have informed us of the plane change so that we could have chosen different seats. We are gold premier members and million-milers -- United should understand that loyalty is a two-way street.