Which countries joined forces to create the Concorde, the world's only supersonic commercial airliner?

The Concorde, a marvel of engineering and a symbol of international collaboration, was the result of a joint effort between Britain and France. In the 1950s and 60s, several countries were exploring supersonic flight, but the costs were astronomical. Britain and France decided to pool their resources and expertise, leading to a formal treaty in 1962 to develop a supersonic transport aircraft. The Concorde's development was a complex undertaking, involving cutting-edge technology and significant political cooperation. The first Concorde prototype flew in 1969, and commercial flights began in 1976. While other nations like the US and the Soviet Union also pursued supersonic travel, the Concorde remains the only successful supersonic commercial airliner to have flown for a significant period. Although Germany and Italy are major players in European aerospace, they weren't part of the original Concorde project. The Concorde represents a unique moment in aviation history, showcasing what can be achieved through international partnership.