The Concorde, of which only 14 were sold, was completely subsidized by France and the UK. The only airlines that got them were the national flag carriers Air France and British Airways. It was a great airplane, has yet to be equaled, but it was as much an achievement of engineering as it was a political achievement.
America landed on the Moon, The Soviets had a Space station and UK and France shared the Concorde.
In America the SST program was cancelled when it became apparent that the airlines could not operate it profitably. Boeing was well along with its SST and had to lay off thousands of engineers when it was cancelled. The 747 was supposed to be a passenger jet that would be easily converted to a freighter when the SST was available. Well, the 747 definitely outlived that era.
In the Soviet Union they finished their SST and it was a fine engineering effort but only a few ever served Aeroflot none were built for export and overall it never reached its potential. (You should read up on the Le Bourget crash of the TU
-144 and the Mirage III near miss that caused it).
In a nutshell that's about it. . .