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

🇺🇸 N17233 - Boeing 737NG 824/W - United Airlines UAL530/UA530, Raleigh-Durham (RDU) to Denver (DEN) - 4.0 mi away @ 35900 ft, heading W at 511 mph. Spotted 16x before! [09:20:05 AM CDT] #A12378 #N17233 #B738 #UNITED #UAL530 #UA530 #ADSB #ADSBbot

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

🇺🇸 N27304 - Boeing 737MAX 8 - United Airlines UAL530/UA530, Raleigh-Durham (RDU) to Denver (DEN) - 4.4 mi away @ 36150 ft, heading W at 438 mph. Spotted 8x before! [09:02:48 AM CST] #A2B416 #N27304 #B38M #UNITED #UAL530 #UA530 #ADSB #ADSBbot