While Concorde had initially held a great deal of customer interest, the project was hit by a large number of order cancellations. The Paris Le Bourget air show crash of the competing Soviet Tupolev Tu-144 had shocked potential buyers, and public concern over the environmental issues presented by a supersonic aircraft—the sonic boom, take-off noise and pollution—had produced a shift in public opinion of SSTs. By 1976 the remaining buyers were from four countries: Britain, France, China, and Iran.[1] Only Air France and British Airways (the successor to BOAC) took up their orders, with the two governments taking a cut of any profits made.[60]