AA 9909 then UA 441 at O'Hare
Waterloo → Chicago → Dallas-Fort Worth
Timetable, Chicago time
17:10AA 9909 from Waterloo at the gate
11:47UA 441 to Dallas-Fort Worth leaves the gate
18 h 37 apart on the timetable, overnight
UA 441 leaves 18 h 37 after AA 9909 arrives on the timetable: more than half a day, so not a connection we count.