AA 654 then F9 1342 at DFW
Las Vegas → Dallas-Fort Worth → Chicago O'Hare
Timetable, Dallas-Fort Worth time
11:51AA 654 from Las Vegas at the gate
06:55F9 1342 to Chicago O'Hare leaves the gate
19 h 04 apart on the timetable, overnight
F9 1342 leaves 19 h 04 after AA 654 arrives on the timetable: more than half a day, so not a connection we count.