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

🇺🇸 N872NN - Boeing 737NG 823/W - American Airlines AAL1121/AA1121, Dallas-Fort Worth (DFW) to Laguardia (LGA) - 4.4 mi away @ 39375 ft, heading NE at 661 mph. Spotted 49x before. [06:18:32 PM CST] #ABFEFD #N872NN #B738 #AMERICAN #AAL1121 #AA1121 #ADSB #ADSBbot