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

🇺🇸 N629SY - EMBRAER S A ERJ 170-200 LL - SKYWEST AIRLINES INC SKW5607/OO5607, Chicago O'Hare (ORD) to Tucson (TUS) - 4.2 mi away @ 36175 ft, heading WSW at 515 mph. Spotted for first time! [10:40:57 AM CDT] #A83953 #N629SY #E75L #SKW5607 #OO5607 #autopilot #ADSB #ADSBbot