OO 9909 then AA 4400 at O'Hare
Waterloo → Chicago → Memphis
Timetable, Chicago time
16:47OO 9909 from Waterloo at the gate
11:50AA 4400 to Memphis leaves the gate
19 h 03 apart on the timetable, overnight
AA 4400 leaves 19 h 03 after OO 9909 arrives on the timetable: more than half a day, so not a connection we count.