🇺🇸 N23DT - CESSNA 421B - ALASTROM AVIATION LLC N23DT - 4.8 mi away @ 21000 ft, heading SW at 223 mph. Spotted for first time! [09:06:59 AM CDT] #A20684 #N23DT #C421 #N23DT #ADSB #ADSBbot