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Sorry but the Concorde doesn't even come close to the SR71 in terms of speed. The Concorde is about half as fast as the SR71. In fact the Concorde can't even match the altitude of the SR71 so it sounds like your story is just that a story. Because why would the SR71 have to wait for a plane that is slower and has to fly lower?
Also the SR-71 has an 85,000ft ceiling vs. 60,000ft on the Concorde, the question is if the SR-71 really needed for Cuba all its 85K ft. So the scenario with the proximity of Cuba and Venezuela is plausible. The 85,000ft were intended for airspace defended by much more sophisticated SAM systems and others. Cuba for sure did not have that. So why bother climb all the way to max alt?