DL 1523 then DL 5885 at Boston
Washington National → Boston → Pittsburgh
Timetable, Boston time
13:34DL 1523 from Washington National at the gate
17:05DL 5885 to Pittsburgh leaves the gate
3 h 31 apart on the timetable
The last days
DL 1523 and DL 5885 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.