F9 1441 then CV 6851 at O'Hare
Atlanta → Chicago → Luxembourg
Timetable, Chicago time
09:00F9 1441 from Atlanta at the gate
21:20CV 6851 to Luxembourg leaves the gate
12 h 20 apart on the timetable
CV 6851 leaves 12 h 20 after F9 1441 arrives on the timetable: more than half a day, so not a connection we count.