UA 2259 then CV 12 at O'Hare
Newark → Chicago → Luxembourg
Timetable, Chicago time
17:16UA 2259 from Newark at the gate
14:55CV 12 to Luxembourg leaves the gate
21 h 39 apart on the timetable, overnight
CV 12 leaves 21 h 39 after UA 2259 arrives on the timetable: more than half a day, so not a connection we count.