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Old Dec 20, 2016 | 7:12 am
  #26  
Tchiowa
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Originally Posted by docbert
1,268 kilometres/hour, which is 787 miles/hour on a SQ flight from SIN to SYD many years ago with a ~300km/hour tailwind. The speed was reported by both the inflight system and my GPS (with a 2km/hour difference between the two)

Yes, that's technically faster than the speed of sound, but as it's relative to the air around the plane we weren't actually above the sound limit (obviously!)
Originally Posted by Loren Pechtel
I don't remember the tailwind involved but once I tried to ask a FA about it as I thought our ground speed was supersonic and I was curious. Somewhere between her and the pilot there was a communications problem and I never got a proper answer. (TPAC, eastbound.)
I see it regularly TPAC eastbound because there is almost always a tailwind.
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