G7 3375 then CV 6851 at O'Hare
St Louis → Chicago → Luxembourg
Timetable, Chicago time
08:23G7 3375 from St Louis at the gate
21:20CV 6851 to Luxembourg leaves the gate
12 h 57 apart on the timetable
CV 6851 leaves 12 h 57 after G7 3375 arrives on the timetable: more than half a day, so not a connection we count.