🇺🇸 N9016S - BOEING 737-8 - Southwest Airlines SWA581/WN581 (AUS-MDW-LGA) - 5.4 mi away @ 39150 ft, heading NE at 525 mph. Spotted 2x before. [04:17:25 PM CDT] #AC761E #N9016S #B38M #SOUTHWEST #SWA581 #WN581 #ADSB #ADSBbot