AA 9909 then UA 1548 at O'Hare
Waterloo → Chicago → Cleveland
Timetable, Chicago time
17:10AA 9909 from Waterloo at the gate
10:45UA 1548 to Cleveland leaves the gate
17 h 35 apart on the timetable, overnight
UA 1548 leaves 17 h 35 after AA 9909 arrives on the timetable: more than half a day, so not a connection we count.