🇺🇸 N221WN - Boeing 737NG 7H4/W - Southwest Airlines SWA436/WN436, Chicago Midway (MDW) to San Antonio (SAT) - 4.5 mi away @ 31650 ft, heading SW at 503 mph. Spotted 72x before. [11:12:01 AM CDT] #A1E6B9 #N221WN #B737 #SOUTHWEST #SWA436 #WN436 #ADSB #ADSBbot