🇺🇸 N8961K - BOEING 737 MAX 8 - Southwest Airlines SWA389/WN389, San Antonio (SAT) to Baltimore/Washington Thurgood Marshall (BWI) - 5.4 mi away @ 39250 ft, heading NE at 566 mph. Spotted 42x before. [04:50:41 PM CDT] #AC5E23 #N8961K #B38M #SOUTHWEST #SWA389 #WN389 #ADSB #ADSBbot