ATC asked 4.000ft of vertical separation to SR-71 to avoid Concorde collisionhttps://theaviationgeekclub.com/air-traffic-controller-tells-the-story-of-when-he-asked-for-vertical-separation-to-an-sr-71-blackbird-crew-in-conflicting-route-with-a-concorde-supersonic-airliner/ by wikidani • 4 years ago 30 6 4 years agoTHtheaviationgeekclub.com