AA 3967 then AA 2504 at Houston
Dallas-Fort Worth → Houston → Chicago
Timetable, Houston time
08:27AA 3967 from Dallas-Fort Worth at the gate
11:26AA 2504 to Chicago leaves the gate
2 h 59 apart on the timetable
The last days
AA 3967 and AA 2504 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.