🇺🇸 N39415 - Boeing 737NG 924ER/W - United Airlines UAL1876/UA1876, Washington Dulles (IAD) to Los Angeles (LAX) - 4.4 mi away @ 35875 ft, heading WSW at 464 mph. Spotted 9x before. [09:39:55 AM CDT] #A4943E #N39415 #B739 #UNITED #UAL1876 #UA1876 #ADSB #ADSBbot