UA 2433 then CV 12 at O'Hare
Boston → Chicago → Luxembourg
Timetable, Chicago time
22:29UA 2433 from Boston at the gate
14:55CV 12 to Luxembourg leaves the gate
16 h 26 apart on the timetable, overnight
CV 12 leaves 16 h 26 after UA 2433 arrives on the timetable: more than half a day, so not a connection we count.