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

🇺🇸 N912UY - Airbus A321 231 - American Airlines AAL3174/AA3174, Portland (PDX) to Charlotte/Douglas (CLT) - 4.3 mi away @ 36575 ft, heading ESE at 558 mph. Spotted 15x before! [02:56:40 AM CDT] #AC9FF2 #N912UY #A321 #AMERICAN #AAL3174 #AA3174 #ADSB #ADSBbot