It’s possible to track Asian flights a large part of the way, but since 1993, when the Russians gave permission for airlines to fly over the pole, there still is no radar, and no air traffic control.  Pilots have to fly about 100 miles to the left or right of the pole and a special kind of tracking takes place between the pilots and the nearest towers.  Pilots have to constantly report their positions, in order to be tracked.  This is some risky flying.  It does save hours of time, and a great deal of fuel, however, it is so cold, that the fuel can reach its freezing point.  Of course there are warning systems that notify the crew of a possibility of freezing fuel; and they can fly at a warmer altitude, but the risks are there.  United Airlines makes over 1,000  polar fly- overs  a year, and other airlines make hundreds, but there is more radiation in that area, and perhaps that is another reason that it is difficult to track these flights by current methods.