AA 537 then F9 1342 at DFW
St Louis → Dallas-Fort Worth → Chicago O'Hare
Timetable, Dallas-Fort Worth time
08:35AA 537 from St Louis at the gate
06:55F9 1342 to Chicago O'Hare leaves the gate
22 h 20 apart on the timetable, overnight
F9 1342 leaves 22 h 20 after AA 537 arrives on the timetable: more than half a day, so not a connection we count.