I couldn’t get positions either. I just knew where it was by the ‘hole’ where all other aircraft had been cleared out!
(And the stacks to the North West and East of aircraft waiting to land, which we very rarely see in Austin)
As you can see from this screenshot of my raw data in my database, ADFDF8 ( VC-25A 82-8000 ) has lat/lon data from 3-3-2016. The only place the lat/lon data comes from for Mode-S aircraft is via FlightAware’s MLAT service.