AA 3324 then KJ 2913 at O'Hare
Boston → Chicago → Seoul
Timetable, Chicago time
08:00AA 3324 from Boston at the gate
11:40KJ 2913 to Seoul leaves the gate
3 h 40 apart on the timetable
The last days
AA 3324 and KJ 2913 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.