Guys!!
All that time flying and you don't read NOTAMs?
www.noradsanta.org
As the old fella does not file flight plans, being rather set in his ways, the Canadians and Americans have the responsibility of tracking him and advising the rest of the world of his progress.
The above website is delightful in a tacky sort of way and the graphics get better each year. Canuck F18's getting outpaced etc etc
The space junk monitoring stations such as at Pyramid Point on Ascension also feed their whack in and I guess that's what Pine Gap is for!!!