🇺🇸 N17431 - BOEING 737 MAX 9 - United Airlines UAL504/UA504, Baltimore/Washington Thurgood Marshall (BWI) to San Francisco (SFO) - 7.7 mi away @ 29925 ft, heading W at 535 mph. Spotted 5x before. [08:48:37 PM CDT] #A12AE4 #N17431 #B39M #UNITED #UAL504 #UA504 #ADSB #ADSBbot