It was to fly even faster than the Concorde, at speeds approaching Mach 3. And even carry more passengers. It would have flown the distance from Los Angeles to New York in under two hours. America’s effort to build a supersonic airliner was an ambitious project spanning a decade and costing a billion in government funding. But even an army of aerospace engineers and the latest in aviation technology was not enough to get America’s Supersonic Transport (SST) off the ground.