I think the decision to route the flight through IAD rather than JFK is a smart one. I don't think JFK-LHR could support a 747-400, only they reduced the number of JFK-LHR flights from 3 to 2 (from 3-763s to 1-763 and 1-744). The IAD-LHR market in the summer on UA is booming. Almost every night this past week United has oversold every single one of its 3-daily non-stops from IAD-LHR and back, and the summer travel season has only begun. I think it was a bad idea for UA to drop 744s from IAD-LHR and IAD-FRA this summer, as they would surely be full if they were on the service. Maybe the aircraft were needed on other routes (ORD-FRA/SFO-LHR).
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