Looks like they didn't teach the model about airplanes.
"Training corpus did not include airplanes, people in wheel chairs,..."
One can also imagine their modelers populating the synthetic training world with all of the planes right now. Like a "Mria" coming right in front of you on 101, as well as F-35 passing you on the left, and of course Millennium Falcon dropping right on you, and all that happening on a flight deck of huge aircraft carrier.