AA 4436 then AA 2925 at Boston
Lexington → Boston → Chicago O'Hare
Timetable, Boston time
15:53AA 4436 from Lexington at the gate
19:38AA 2925 to Chicago O'Hare leaves the gate
3 h 45 apart on the timetable
The last days
AA 4436 and AA 2925 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.