F9 4353 then AA 2937 at Charlotte
Philadelphia → Charlotte → St Louis
Timetable, Charlotte time
16:40F9 4353 from Philadelphia at the gate
16:28AA 2937 to St Louis leaves the gate
23 h 48 apart on the timetable, overnight
AA 2937 leaves 23 h 48 after F9 4353 arrives on the timetable: more than half a day, so not a connection we count.