DL 5864 then B6 811 at Boston
Green Bay → Boston → Chicago O'Hare
Timetable, Boston time
16:56DL 5864 from Green Bay at the gate
17:05B6 811 to Chicago O'Hare leaves the gate
9 min apart on the timetable
The last days
DL 5864 and B6 811 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.