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

🇺🇸 N8522P - Boeing 737NG 800/W - Southwest Airlines SWA1966/WN1966, Phoenix Sky Harbor (PHX) to Baltimore/Washington Thurgood Marshall (BWI) - 0.7 mi away @ 37900 ft, heading ENE at 515 mph. Spotted 74x before! [08:41:14 PM CDT] #ABB172 #N8522P #B738 #SOUTHWEST #SWA1966 #WN1966 #ADSB #ADSBbot