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

🇺🇸 N18223 - Boeing 737NG 824/W - United Airlines UAL500/UA500 (IND-SFO-SNA-IAH) - 4.3 mi away @ 38250 ft, heading WSW at 505 mph. Spotted 14x before! [05:56:18 AM CDT] #A14AD4 #N18223 #B738 #UNITED #UAL500 #UA500 #ADSB #ADSBbot