Unexpected Airport Code

FlightAware AeroAPI
1

I received an unexpected airport code for the origin of a particular flight. I expected an ICAO airport code but received a string that looks like a set of GPS coordinates.

faFlightID: N99TV-1585930270-adhoc-0
returned origin airport code: L 33.60006 -111.87098

I assumed that a blank string would be returned if no airport code was available. Is this expected behavior? Why did I received GPS coordinates to a point that is not an airport?

Thanks.

2

That is a “position-only” flight that we did not receive a flightplan for, so we recorded the origin as the first position that the flight was detected. https://flightaware.com/about/faq#adhoc