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

🇺🇸 N339HG - AMERICAN AIRLINES INC ENY3922/MQ3922 (DFW-FWA-DFW) - 4.1 mi away @ 30500 ft, heading NE at 603 mph. Spotted for first time! [02:42:01 PM CST] #A3B7F4 #N339HG #ENY3922 #MQ3922 #autopilot #ADSB #ADSBbot