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

🇺🇸 N21108 - Boeing 757 224/W - United Airlines UAL1981/UA1981 (IAD-LAX-EWR) - 4.3 mi away @ 36700 ft, heading ENE at 560 mph. Spotted 2x before! [04:41:37 PM CDT] #A1BFB2 #N21108 #B752 #UNITED #UAL1981 #UA1981 #ADSB #ADSBbot

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

🇺🇸 N69835 - Boeing 737NG 924ER/W - United Airlines UAL1981/UA1981 (IAD-LAX-EWR) - 4.3 mi away @ 35675 ft, heading W at 505 mph. Spotted 10x before! [07:37:59 AM CDT] #A94B4D #N69835 #B739 #UNITED #UAL1981 #UA1981 #ADSB #ADSBbot