AA 1709 then WN 1090 at Charlotte
Myrtle Beach → Charlotte → St Louis
Timetable, Charlotte time
06:14AA 1709 from Myrtle Beach at the gate
18:20WN 1090 to St Louis leaves the gate
12 h 06 apart on the timetable
WN 1090 leaves 12 h 06 after AA 1709 arrives on the timetable: more than half a day, so not a connection we count.