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

🇺🇸 N270NN - EMBRAER S A ERJ 170-200 LR - AMERICAN AIRLINES INC ENY4000/MQ4000 (ORD-MSY-ORD) - 4.0 mi away @ 33525 ft, heading N at 509 mph. Spotted 41x before. [04:18:39 PM CST] #A2A7B5 #N270NN #E75L #ENY4000 #MQ4000 #autopilot #ADSB #ADSBbot