OO 9909 then UA 535 at O'Hare
Waterloo → Chicago → Houston
Timetable, Chicago time
16:47OO 9909 from Waterloo at the gate
09:21UA 535 to Houston leaves the gate
16 h 34 apart on the timetable, overnight
UA 535 leaves 16 h 34 after OO 9909 arrives on the timetable: more than half a day, so not a connection we count.