AA 894 then AA 1173 at O'Hare
Boston → Chicago → Pittsburgh
Timetable, Chicago time
14:40AA 894 from Boston at the gate
18:30AA 1173 to Pittsburgh leaves the gate
3 h 50 apart on the timetable
The last days
AA 894 and AA 1173 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.