the winter cutbacks out of iad are very common. 2 planes to 1, 777 instead of 747, 777 to 767, and fewer days. the day i looked i did not see a nonstop biz saver gve-iad, but there was one gve -ewr only about 5 of 50 seats taken.
i am flying iad-lys-iad(with transfers and layovers) on oct 30-nov8. i wanted to go earlier, but no seats available. now there is a ton of availability over the whole month of oct.
couple months ago, we flew back bcn-gve-iad in biz. think on a ua 767.