OO 9909 then ET 575 at O'Hare
Waterloo → Chicago → Addis Ababa
Timetable, Chicago time
16:47OO 9909 from Waterloo at the gate
09:45ET 575 to Addis Ababa leaves the gate
16 h 58 apart on the timetable, overnight
ET 575 leaves 16 h 58 after OO 9909 arrives on the timetable: more than half a day, so not a connection we count.