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

🇺🇸 N14540 - UNITED AIRLINES INC UAL660/UA660, Chicago O'Hare (ORD) to San Diego (SAN) - 4.2 mi away @ 33875 ft, heading SW at 513 mph. Spotted for first time! [10:05:15 AM CDT] #A0B840 #N14540 #UAL660 #UA660 #ADSB #ADSBbot

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

🇺🇸 N69847 - Boeing 737NG 924ER/W - United Airlines UAL660/UA660, Chicago O'Hare (ORD) to San Diego (SAN) - 3.9 mi away @ 34025 ft, heading WSW at 525 mph. Spotted 6x before! [10:14:58 AM CDT] #A94B72 #N69847 #B739 #UNITED #UAL660 #UA660 #ADSB #ADSBbot

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

🇺🇸 N78438 - Boeing 737NG 924ER/W - United Airlines UAL660/UA660 (SYR-ORD-SAN-IAD) - 4.4 mi away @ 34925 ft, heading E at 612 mph. Spotted 8x before! [06:35:12 PM CST] #AAA244 #N78438 #B739 #UNITED #UAL660 #UA660 #ADSB #ADSBbot