UA 4189 then DL 3737 at Detroit
Newark → Detroit → Milwaukee
Timetable, Detroit time
15:23UA 4189 from Newark at the gate
17:40DL 3737 to Milwaukee leaves the gate
2 h 17 apart on the timetable
The last days
UA 4189 and DL 3737 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.