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

🇺🇸 N987NN - Boeing 737NG 823/W - American Airlines AAL1728/AA1728 (PHX-DTW-PHX) - 4.7 mi away @ 39400 ft, heading WSW at 482 mph. Spotted 51x before! [05:05:43 PM CDT] #ADC65E #N987NN #B738 #AMERICAN #AAL1728 #AA1728 #ADSB #ADSBbot