Since this is over Alaska, I looked up Track log for UA 897 on Flight Aware.

http://flightaware.com/live/flight/U.../RJAA/tracklog

There weren't much activity once the plane entered region controlled by Anchorage Center. Except the following:

06:52PM 61.47 -147.53 270° West 460 529 0.80 32,000 -660 Anchorage Center
06:53PM 61.47 -147.82 270° West 460 529 0.80 30,700 -1,020 Anchorage Center
06:54PM 61.47 -148.08 270° West 470 541 0.81 30,000 -360 Anchorage Center