AA 3664 then AS 429 at O'Hare
Buffalo → Chicago → Seattle (SEA)
Timetable, Chicago time
12:29AA 3664 from Buffalo at the gate
18:35AS 429 to Seattle (SEA) leaves the gate
6 h 06 apart on the timetable
The last days
AA 3664 and AS 429 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.