Originally Posted by
frontenac551
When you say that you "cannot see them when making a booking on united.com", do you mean that you don't see the new seating when looking at the seat maps? All of my recent GVA-EWR/EWR-GVA flights have been on retrofitted planes (though not all of the planes on this route are), but the old seat map was showing up until a day or two before each flight. I've also had the retrofitted plane on other US-Europe flights (again, not showing until a couple of days before the flight).
This. They're specifically not loading the retrofit 767s into the seat maps for advance bookings, both to give themselves maximal operational flexibility and to prevent disappointment for passengers who got swapped to the old configuration.
There's no sure way to book the retrofit planes; the best you can do is to watch to see which sub-fleets are being converted and then try to book a flight on those planes.
As for the 77Ws, which are coming with Polaris already and only being retrofit to add PE; those are more likely to end up on the schedule, but they're also mostly using them out of SFO. There's virtually no chance to find that on AMS-EWR; it's too short and too light of a route.