OO 9909 then UA 441 at O'Hare
Waterloo → Chicago → Dallas-Fort Worth
Timetable, Chicago time
16:47OO 9909 from Waterloo at the gate
11:47UA 441 to Dallas-Fort Worth leaves the gate
19 h apart on the timetable, overnight
UA 441 leaves 19 h after OO 9909 arrives on the timetable: more than half a day, so not a connection we count.