🇺🇸 N17443 - BOEING 737 MAX 9 - United Airlines UAL1873/UA1873, Phoenix Sky Harbor (PHX) to Washington Dulles (IAD) - 4.6 mi away @ 35250 ft, heading E at 566 mph. Spotted once before. [01:57:46 PM CDT] #A12B09 #N17443 #B39M #UNITED #UAL1873 #UA1873 #ADSB #ADSBbot