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

🇺🇸 N8660A - Boeing 737NG 8H4/W - Southwest Airlines SWA1559/WN1559 (STL-SAN-SJC) - 4.3 mi away @ 13525 ft, heading WNW at 442 mph. Spotted 85x before! [04:51:50 PM CDT] #ABE77A #N8660A #B738 #SOUTHWEST #SWA1559 #WN1559 #TakingOff #ADSB #ADSBbot