Forty years ago, some people in the plane-making industry believed that supersonic transport (SST) was inevitable. Supersonic aircraft (SSTs) would soon fly at twice the speed of sound or more—between 2200 and 2900 kilometres per hour. Sales of hundreds, even thousands of SSTs were predicted. Governments in Britain, France, the US and the Soviet Union gave aircraft manufacturers vast sums of money to pursue this fantasy.
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