BR 662 then UA 1580 at O'Hare
Anchorage → Chicago → Boston
Timetable, Chicago time
06:39BR 662 from Anchorage at the gate
12:46UA 1580 to Boston leaves the gate
6 h 07 apart on the timetable
The last days
BR 662 and UA 1580 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.