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" ... The numbers for the proposed Aerion SSBJ remain essentially unchanged: max cruise Mach 1.6, max long-range cruise speed Mach 1.4 to 1.5, max subsonic long-range cruise Mach 0.95 to 0.96 and 100,000 lb or less mtow. “It’s basically the same performance envelope but we are constantly reviewing and refining with a view to improving the design of the aircraft for the advent of Stage 5 noise requirements, for example, and longer range,” said Nichols. “It’s a constantly evolving project, but still fairly tightly contained around the performance parameters we’ve identified.” ... "