The “Filed Speed” used to match what I filed on my flight plan; but more often than not does not match anymore. I’ve noticed this on other aircraft, too. Filed speed should be the expected True Airspeed, and therefore is not subject to wind. It appears that some algorithm is trying to apply a wind adjustment to the filed speed to get an estimated ground speed. Is this being done by the data source or by FlightAware?
I personally would prefer to see the speed that was actually filed on the flight plan, not some wind adjusted estimation. If that isn’t possible (for example, the data as received by FA already has some unknown adjustment applied), then this field should be identified as “Estimated Speed” or similar, but certainly not “Filed Speed,” because it isn’t.
Thanks for a great site, FlightAware!