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

🇺🇸 N871HK - Boeing 737MAX 8 - Southwest Airlines SWA3719/WN3719, Baltimore/Washington Thurgood Marshall (BWI) to Harry Reid (LAS) - 4.4 mi away @ 36725 ft, heading W at 428 mph. Spotted 31x before! [07:15:52 PM CDT] #ABFAC6 #N871HK #B38M #SOUTHWEST #SWA3719 #WN3719 #ADSB #ADSBbot