AA 4504 then DL 1564 at O'Hare
South Bend → Chicago → Seattle (SEA)
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
12:58DL 1564 to Seattle (SEA) leaves the gate
18 h 23 apart on the timetable, overnight
DL 1564 leaves 18 h 23 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.