🇺🇸 N8876Q - Boeing 737MAX 8 - Southwest Airlines SWA3139/WN3139, Phoenix Sky Harbor (PHX) to Baltimore/Washington Thurgood Marshall (BWI) - 6.8 mi away @ 39225 ft, heading E at 561 mph. Spotted 108x before. [09:43:59 AM CDT] #AC3B0F #N8876Q #B38M #SOUTHWEST #SWA3139 #WN3139 #ADSB #ADSBbot