AA 3234 then AS 637 at Seattle
Chicago O'Hare → Seattle → Portland (Oregon)
Timetable, Seattle time
10:16AA 3234 from Chicago O'Hare at the gate
15:53AS 637 to Portland (Oregon) leaves the gate
5 h 37 apart on the timetable
Seattle’s board gives a departure time for only about 57% of its flights, so many days show no gate time.
The last days
AA 3234 and AS 637 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.