🇺🇸 N842SY - Boeing 737NG 8K5/W - Sun Country Airlines SCX8143/SY8143, Gulfport-Biloxi (GPT) to St Louis Lambert (STL) - 3.4 mi away @ 3500 ft, heading NNW at 276 mph. Spotted 13x before. [05:03:13 PM CDT]