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

🇺🇸 N87507 - Boeing 737NG 824/W - United Airlines UAL1500/UA1500, Baltimore/Washington Thurgood Marshall (BWI) to San Francisco (SFO) - 5.1 mi away @ 42225 ft, heading W at 505 mph. Spotted 14x before! [07:24:23 AM CDT] #AC0B61 #N87507 #B738 #UNITED #UAL1500 #UA1500 #ADSB #ADSBbot