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

🇺🇸 N280WN - Boeing 737NG 7H4/W - Southwest Airlines SWA1530/WN1530 (BWI-MDW-DAL) - 4.7 mi away @ 39850 ft, heading SW at 393 mph. Spotted 78x before. [12:54:31 PM CST] #A2CFFC #N280WN #B737 #SOUTHWEST #SWA1530 #WN1530 #ADSB #ADSBbot