Map of the St. Louis area showing the position and track of the aircraft described in the post.
🇺🇸 N8509U - Boeing 737NG 800/W - Southwest Airlines SWA2308/WN2308, Baltimore/Washington Thurgood Marshall (BWI) to San Diego (SAN) - 4.2 mi away @ 36200 ft, heading W at 438 mph. Spotted 84x before. [09:48:04 PM CDT] #ABAAFE #N8509U #B738 #SOUTHWEST #SWA2308 #WN2308 #ADSB #ADSBbot