UA 2720 then CV 12 at O'Hare
Jacksonville → Chicago → Luxembourg
Timetable, Chicago time
18:34UA 2720 from Jacksonville at the gate
14:55CV 12 to Luxembourg leaves the gate
20 h 21 apart on the timetable, overnight
CV 12 leaves 20 h 21 after UA 2720 arrives on the timetable: more than half a day, so not a connection we count.