UA 450 then GB 397 at O'Hare
Toronto Pearson → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
11:57UA 450 from Toronto Pearson at the gate
07:00GB 397 to Cincinnati Northern Kentucky leaves the gate
19 h 03 apart on the timetable, overnight
GB 397 leaves 19 h 03 after UA 450 arrives on the timetable: more than half a day, so not a connection we count.