The Concorde aircraft, despite actually managing to be profitable, proved that airlines could, in theory, turn a profit if ...
Denver-based Boom Technology's XB-1 demonstrator plane hit Mach 1.122 — 750 mph. It's the first independently developed ...
However, the jet was criticized for its inefficiency. Compared to a Boeing 747, the delta-wing Concorde guzzled four times as much fuel and carried only one-fifth as many passengers — around 100.
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