See my photo of F-BVFC which was used that day on the presidential flight: F-BVFA First flew on from Toulouse. This was certainly the reserve of the presidential flight AF100F. This aircraft did not fly on May 28, 1983 Thanks to jailemanche for the fascinating information which I have tried to translate below:
The only chance of seeing a Concorde with the nose up was when static or under tow, as they always taxied with the nose drooped. F-BVFA (c/n 205) - the first of Air France's fleet of seven Concordes - seen under tow in a corner of Paris CDG (Le Roissy) airfield.