🇺🇸 N39297 - Boeing 737NG 824/W - United Airlines UAL573/UA573, St Louis Lambert (STL) to San Francisco (SFO) - 4.0 mi away @ 15300 ft, heading WNW at 409 mph. Spotted 5x before. [07:31:31 AM CDT] #A48DEA #N39297 #B738 #UNITED #UAL573 #UA573 #Departure #ADSB #ADSBbot