DL 1953 then DL 878 at Boston
Fort Lauderdale → Boston → Washington National
Timetable, Boston time
14:35DL 1953 from Fort Lauderdale at the gate
20:05DL 878 to Washington National leaves the gate
5 h 30 apart on the timetable
The last days
DL 1953 and DL 878 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.