UA 2657 then CV 12 at O'Hare
Atlanta → Chicago → Luxembourg
Timetable, Chicago time
20:07UA 2657 from Atlanta at the gate
14:55CV 12 to Luxembourg leaves the gate
18 h 48 apart on the timetable, overnight
CV 12 leaves 18 h 48 after UA 2657 arrives on the timetable: more than half a day, so not a connection we count.