DL 5712 then DL 1624 at Boston
Columbus (Ohio) → Boston → Chicago O'Hare
Timetable, Boston time
12:46DL 5712 from Columbus (Ohio) at the gate
13:35DL 1624 to Chicago O'Hare leaves the gate
49 min apart on the timetable
The last days
DL 5712 and DL 1624 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.