Old Fella,
OK my US geography may not be as good as your but how can a CX aircraft be over the midwest, going in ANY direction ,on its way to or from HKG. JFK to HKG goes pretty close to the north pole. JFK to YVR maybe had to go round a lot of weather? Yes I don't know but you know even less apparently. May have been a freighter that had fuel as its freight but other than that I doubt he was going to or from HKG.