Tobzalp -- you were waaay to quick to jump in with that "BS" comment.
I am one of many ppruners who know this particular OP very well. He is a retired ATCO from YVR and we just recently talked him into having a look at pprune. (He's an old fart ya know, not too sure about this here internet thingy -- the radar was steam driven in those days.)
Everyone who worked in SEA or OAK or YVR in 1986 knows the story well. And I was lucky enough to be controlling that day too. Expo 86, along with the Abbotsford Airshow. Concorde was in town for both. Had departed YVR westbound out over the Pacific for a special "tour" -- full of dignitaries, politicians, etc. Whilst enjoying the view at FL600, an SR71 came blasting up (originally from Beale of course) northbound over "the water" and when he began his (HUGE) turn east (to go south again) that very controller had to tell the Concorde to "maintain FL580". The incredulous comments from the somewhat "uppity" Concorde Captain -- and the controller's replies, are for another time!
Welcome (finally) to pprune, blackbirdman!
grizz