OO 9909 then AA 789 at O'Hare
Waterloo → Chicago → Washington National
Timetable, Chicago time
16:47OO 9909 from Waterloo at the gate
13:18AA 789 to Washington National leaves the gate
20 h 31 apart on the timetable, overnight
AA 789 leaves 20 h 31 after OO 9909 arrives on the timetable: more than half a day, so not a connection we count.