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mmciau
25th Feb 2010, 20:09
See where BOE01 has reached Mach 1.07 Groundspeed during testing today 19.34 UTC 25 February 2010 according to FlightAware Log

FlightAware > Boeing Commercial Airplane Group #1 (http://flightaware.com/live/flight/BOE1)

Mike

kenparry
26th Feb 2010, 14:42
reached Mach 1.07 Groundspeed

What you might call a terminological inexactitude.

Mach number is defined as TAS divided by the local speed of sound. So a "Mach groundspeed" does not exist.