🇺🇸 N959WN - Boeing 737NG 7H4/W - Southwest Airlines SWA1837/WN1837, Phoenix Sky Harbor (PHX) to Pittsburgh (PIT) - 5.3 mi away @ 40925 ft, heading ENE at 550 mph. Spotted 89x before. [08:56:56 PM CDT] #AD5817 #N959WN #B737 #SOUTHWEST #SWA1837 #WN1837 #ADSB #ADSBbot