I would expect crews in that part of the world will already know where they are going before the EICAS squawks into life. Routing to SEA/SFO/LAX from Europe leaves you spending a lot of time over unforgiving terrain with few options available.
I sympathise greatly wish the crew having sat there looking at the weather and plates at the likes of Yellowknife and Iqualuit and offering a quiet prayer to messrs RR or GE as we approach the edges of those nice ETOPS circles.