Interesting catch

and its not at Boeing, its farther down the field, near the new terminal.

ICAO Ident Squawk Altitude (ft) Speed (kt) Distance (NM) Heading Msgs Age
A8522B Flag TEST 3456 ground 0 2.2 124 11

Notice I have 2 GTI Dream Lifters on the ground too

ICAO Ident Squawk Altitude (ft) Speed (kt) Distance (NM) Heading Msgs Age
AA90A0 Flag GTI4536 1110 ground 0 2.1 354° 4902 9
A25188 Flag GTI4516 1652 ground 1 2.3 1195 0