🇺🇸 N828SY - Boeing 737NG 8F2/W - Sun Country Airlines SCX8728/SY8728, St Louis Downtown (CPS) to Denver (DEN) - 3.9 mi away @ 22200 ft, heading NW at 435 mph. Spotted 12x before. [02:46:20 PM CDT] #AB503A #N828SY #B738 #SUN_COUNTRY #SCX8728 #SY8728 #ADSB #ADSBbot