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

🇺🇸 N549UW - Airbus A321 231 - American Airlines AAL2074/AA2074 (DFW-DTW-DFW) - 4.8 mi away @ 39975 ft, heading SW at 551 mph. Spotted 10x before! [08:58:04 PM CDT] #A6FB32 #N549UW #A321 #AMERICAN #AAL2074 #AA2074 #ADSB #ADSBbot