F9 1523 then AA 3735 at DFW
St Louis → Dallas-Fort Worth → Gainesville
Timetable, Dallas-Fort Worth time
14:17F9 1523 from St Louis at the gate
08:30AA 3735 to Gainesville leaves the gate
18 h 13 apart on the timetable, overnight
AA 3735 leaves 18 h 13 after F9 1523 arrives on the timetable: more than half a day, so not a connection we count.