F9 1523 then DL 735 at DFW
St Louis → Dallas-Fort Worth → Detroit
Timetable, Dallas-Fort Worth time
14:17F9 1523 from St Louis at the gate
13:52DL 735 to Detroit leaves the gate
23 h 35 apart on the timetable, overnight
DL 735 leaves 23 h 35 after F9 1523 arrives on the timetable: more than half a day, so not a connection we count.