AirportBoards returned a flight result (FA ID: CHH8954-1502342754-airline-0239) for CHH8954 (Hainan’s codeshare for AAL438); no such record should have been returned.
May have been related to the flight being cancelled. I wouldn’t try to read any meaning from that flight_id though.
Was just including the flight ID for your reference; just saying the record itself shouldn’t have been included in the AirportBoards data for SEA or DFW since it was an AAL flight.