Boeing unveils plans for airliner that will fly from US to Japan in three hours
SEE ALSO :All 157 in Ethiopian airliner crash deadBy comparison, the retired Concorde was a supersonic aircraft that traveled at Mach 2, twice the speed of sound. A flight from New York to London took less than four hours. Last year, Boston-based group Spike Aerospace completed a round of test flights on a prototype aircraft that will eventually be able to reach cruising altitudes of Mach 1.6, ferrying passengers between New York and Tokyo in six to seven hours. Spike Aerospace says it aims to launch the commercial supersonic aircraft by 2023. Additional reporting by agencies
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