OO 9909 then AA 3683 at O'Hare
Waterloo → Chicago → Bangor
Timetable, Chicago time
16:47OO 9909 from Waterloo at the gate
13:36AA 3683 to Bangor leaves the gate
20 h 49 apart on the timetable, overnight
AA 3683 leaves 20 h 49 after OO 9909 arrives on the timetable: more than half a day, so not a connection we count.