DL 3802 then AA 2398 at Seattle
Portland (Oregon) → Seattle → Chicago O'Hare
Timetable, Seattle time
15:25DL 3802 from Portland (Oregon) at the gate
15:10AA 2398 to Chicago O'Hare leaves the gate
23 h 45 apart on the timetable, overnight
AA 2398 leaves 23 h 45 after DL 3802 arrives on the timetable: more than half a day, so not a connection we count.