Flights-How fast are they?

Last Year when I was taking a flight back from Kolkata to Guwahati,I managed to get something on my cell that I never expected.At that time I was using Nokia Lumia 720 and as you all know after boarding the flight the cell should be on flight mode,even I did so..But the GPS of my cell was working with an app HERE DRIVE,So I started the app and this is what I got….

Flight Speed 2

Flight Speed 2

The Speed of the flight when it was at the main Runway…whopping 610km/h

Flight Speed 1

Flight Speed 1

And when it was taking off..Whopping 828km/h

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