🇺🇸 N14509 - Airbus A321 271NXSL - United Airlines UAL660/UA660, Chicago O'Hare (ORD) to San Diego (SAN) - 4.3 mi away @ 31875 ft, heading SW at 524 mph. Spotted 6x before. [09:53:30 AM CDT] #A0B7BD #N14509 #A21N #UNITED #UAL660 #UA660 #ADSB #ADSBbot