Map of the St. Louis area showing the position and track of the aircraft described in the post.

🇺🇸 N400AN - Airbus A321 253NXSL - American Airlines AAL252G/AA252G, Miami (MIA) to Seattle-Tacoma (SEA) - 3.6 mi away @ 31375 ft, heading NW at 500 mph. Spotted 12x before! [10:28:58 AM CDT] #A4ACAE #N400AN #A21N #AMERICAN #AAL252G #AA252G #ADSB #ADSBbot