AA 6366 then 5X 5603 at O'Hare
Waterloo → Chicago → Louisville
Timetable, Chicago time
07:39AA 6366 from Waterloo at the gate
07:305X 5603 to Louisville leaves the gate
23 h 51 apart on the timetable, overnight
5X 5603 leaves 23 h 51 after AA 6366 arrives on the timetable: more than half a day, so not a connection we count.