Ah…is this track (see JPEG) the result of corrupt data ?
Never seen a 408 kias twin commanche before
…weird, anyway I think FlightAware is the coolest !!! I probably check on flights 20 times or more a day… 
The aircraft is a G2(twin jet). FA just got the name wrong on the side bar. Change of N numbers may be?
A *JT from Greystone, that’s one of Travolta’s no?
It is indeed.
Somewhere between the pilot and ATC they got the wrong aircraft type code in the system.
I just looked again, and it is not so much the groundspeed that would stand out to me for a prop (even though we now know it is a jet), but it is the FL430. 