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

🇺🇸 N8988S - Southwest Airlines SWA4122/WN4122, St Louis Lambert (STL) to Phoenix Sky Harbor (PHX) - 3.3 mi away @ 7300 ft, heading SW at 328 mph. Spotted 4x before. [03:02:59 PM CDT] #AC668D #N8988S #B38M #SOUTHWEST #SWA4122 #WN4122 #Landing #Departure #ADSB #ADSBbot