BAC-Aerospatiale Concorde / United AirlinesUnited Airlines Concorde airplane model. The Concorde was a joint engineering feat between Britain and France, resulting in the world's only scheduled passenger flights at supersonic speed. Despite flying over 25 years ago, it still represents the pinnacle of civil aviation, thanks to its incredible speed. The partnership between BAC and Aerospatiale, formed after an agreement between the two governments in 1962, was crucial in creating this