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

🇺🇸 N8554X - Boeing 737NG 800/W - Southwest Airlines SWA2836/WN2836, Washington Dulles (IAD) to Phoenix Sky Harbor (PHX) - 4.4 mi away @ 36200 ft, heading W at 463 mph. Spotted 83x before. [06:20:38 PM CDT] #ABBCE5 #N8554X #B738 #SOUTHWEST #SWA2836 #WN2836 #ADSB #ADSBbot