AA 2511 then DL 5875 at Boston
Chicago O'Hare → Boston → Pittsburgh
Timetable, Boston time
10:33AA 2511 from Chicago O'Hare at the gate
15:00DL 5875 to Pittsburgh leaves the gate
4 h 27 apart on the timetable
The last days
AA 2511 and DL 5875 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.