Originally Posted by
Airbubba
Ian at FlightRadar24 has harvested some indicated airspeed data from the extended Mode-S data fields
Interesting - that will certainly warrant further analysis.
One word of caution - the data from the 14 different receivers isn't synchronised, as they all seem to be running different clocks, hence there is a lot of spurious jitter when you try to plot timeseries. So you get, for example, TAS jumping from 374 kts to 400 kts with timestamps only half a second apart.
But that's not an insurmountable problem, it should be possible to deduce the relative time offsets that should be applied to the data from respective receivers and produce a more accurate plot.