DL 1558 then AA 9949 at Detroit
Washington National → Detroit → Pittsburgh
Timetable, Detroit time
11:22DL 1558 from Washington National at the gate
19:20AA 9949 to Pittsburgh leaves the gate
7 h 58 apart on the timetable
The last days
DL 1558 and AA 9949 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.