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

🇺🇸 N8575Z - Boeing 737NG 800/W - Southwest Airlines SWA4301/WN4301, San Francisco (SFO) to Baltimore/Washington Thurgood Marshall (BWI) - 4.8 mi away @ 41600 ft, heading E at 603 mph. Spotted 101x before! [02:39:16 AM CST] #ABC478 #N8575Z #B738 #SOUTHWEST #SWA4301 #WN4301 #ADSB #ADSBbot