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

🇺🇸 N403AN - Airbus A321 253NXSL - American Airlines AAL990/AA990, Philadelphia (PHL) to Los Angeles (LAX) - 4.3 mi away @ 35600 ft, heading W at 508 mph. Spotted 6x before! [08:24:31 PM CDT] #A4B7D3 #N403AN #A21N #AMERICAN #AAL990 #AA990 #ADSB #ADSBbot