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

🇺🇸 N959NN - Boeing 737NG 823/W - American Airlines AAL3121/AA3121, Dallas-Fort Worth (DFW) to Detroit Metro Wayne County (DTW) - 4.1 mi away @ 37400 ft, heading NE at 667 mph. Spotted 49x before. [06:33:43 PM CST] #AD574F #N959NN #B738 #AMERICAN #AAL3121 #AA3121 #ADSB #ADSBbot