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Old Mar 9, 2017 | 11:05 am
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caliform
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Originally Posted by jbjelloid
Yesterday on the 747 flight from JFK to AMS the flight map showed speeds of 1135kph and 707mph as we flew over England. Is that even possible? I was waiting for a sonic boom. Captain did mention 'extreme winds".
Likely IAS - 'Indicated Airspeed', which is not corrected for instrument deviation and added winds. It's not the true airspeed or groundspeed, so in the end you likely weren't traveling at transonic speeds
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