AA 359 then DL 637 at O'Hare
Washington National → Chicago → Seattle (SEA)
Timetable, Chicago time
16:08AA 359 from Washington National at the gate
16:00DL 637 to Seattle (SEA) leaves the gate
23 h 52 apart on the timetable, overnight
DL 637 leaves 23 h 52 after AA 359 arrives on the timetable: more than half a day, so not a connection we count.