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

🇺🇸 N29717 - Boeing 737NG 724/W - United Airlines UAL3877/UA3877, Chicago/Rockford (RFD) to George Bush Intcntl/Houston (IAH) - 22.0 mi away @ 39750 ft, heading SSW at 493 mph. Spotted 37x before! [10:47:14 AM CST] #A31216 #N29717 #B737 #UNITED #UAL3877 #UA3877 #ADSB #ADSBbot