DL 1724 then GB 397 at O'Hare
Boston → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
18:20DL 1724 from Boston at the gate
07:00GB 397 to Cincinnati Northern Kentucky leaves the gate
12 h 40 apart on the timetable, overnight
GB 397 leaves 12 h 40 after DL 1724 arrives on the timetable: more than half a day, so not a connection we count.