UA 646 then MQ 4262 at O'Hare
Portland (Maine) → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
10:47UA 646 from Portland (Maine) at the gate
00:57MQ 4262 to Cincinnati Northern Kentucky leaves the gate
14 h 10 apart on the timetable, overnight
MQ 4262 leaves 14 h 10 after UA 646 arrives on the timetable: more than half a day, so not a connection we count.