AA 1668 then CV 278 at O'Hare
Dallas-Fort Worth → Chicago → Luxembourg
Timetable, Chicago time
23:15AA 1668 from Dallas-Fort Worth at the gate
23:00CV 278 to Luxembourg leaves the gate
23 h 45 apart on the timetable, overnight
CV 278 leaves 23 h 45 after AA 1668 arrives on the timetable: more than half a day, so not a connection we count.