WN 1555 then AA 4746 at Boston
Denver → Boston → Washington National
Timetable, Boston time
01:15WN 1555 from Denver at the gate
12:39AA 4746 to Washington National leaves the gate
11 h 24 apart on the timetable
The last days
WN 1555 and AA 4746 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.