> "The Soviets also had a design that supposedly incorporated stolen Concorde blueprints" From what I understand, the Tu-144 didn't really incorporate anything

> "The Soviets also had a design that supposedly incorporated stolen Concorde blueprints" From what I understand, the Tu-144 didn't really incorporate anything of significance from Concorde -- the plans they had access to were more like sketches than fully fleshed out blueprints, and they only had usable details on a few minor components. The Tu-144 shares mostly superficial similarities with Concorde, with only a couple of similarities that might possibly have been the result of espionage.