AA 1618 then AA 4005 at O'Hare
Dallas-Fort Worth → Chicago → Madison
Timetable, Chicago time
15:19AA 1618 from Dallas-Fort Worth at the gate
18:59AA 4005 to Madison leaves the gate
3 h 40 apart on the timetable
The last days
AA 1618 and AA 4005 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.