DL 2194 then DL 934 at Detroit
Washington → Detroit → New York JFK
Timetable, Detroit time
07:40DL 2194 from Washington at the gate
19:00DL 934 to New York JFK leaves the gate
11 h 20 apart on the timetable
The last days
DL 2194 and DL 934 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.