Radarman
I remember your 'happening'.
The levels Concorde used to cruise at were much lower than those of the SR71. This 'Bird' used to switch on its Mode C when leaving 80,000' in the descent. It would have been a rare occasion for both 'Birds' to have been in level flight in the same area at the same time.
Due to the specific operating parameters of both 'Birds' it is difficult to envisage how Blackbirdman would have had to move 'Concord' unless it was in level flight and the SR71 was in climb/descent mode.
I look forward to more specific details of his 'happening'.
Cheers
