DL 559 then DL 3850 at Detroit
Austin → Detroit → Pittsburgh
Timetable, Detroit time
12:00DL 559 from Austin at the gate
21:39DL 3850 to Pittsburgh leaves the gate
9 h 39 apart on the timetable
The last days
DL 559 and DL 3850 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.