UA 2770 then CV 12 at O'Hare
Des Moines → Chicago → Luxembourg
Timetable, Chicago time
20:25UA 2770 from Des Moines at the gate
14:55CV 12 to Luxembourg leaves the gate
18 h 30 apart on the timetable, overnight
CV 12 leaves 18 h 30 after UA 2770 arrives on the timetable: more than half a day, so not a connection we count.