UA seating and fleet
United is in the middle of upgrading all its 763 fleet interiors, including adding winglets etc. First Class is being removed and replaced with 30 Business First / 46 Economy Plus / 138 Economy (total 214 seats) which is considered a better fit for most of their transatlantic routes. Plan is to use the 763s on some transatlantic routes, freeing up 777s and 757s for US domestic and South American runs. So far the 763s seem to have replaced 752s on longer routes like EWR-Hamburg and EWR-Barcelona, but maybe MAN will start to see them as they get more of the fleet done.
According to an internal UA survey the 763 is still the second most popular aircraft type with UA's customers, mainly because of the 2x3x2 abreast seating in economy - as opposed to the 3x3x3 or 3x4x3 sardine configurations which many newer wide body types seem to feature these days.