AA 4170 then UA 5618 at O'Hare
Oklahoma City → Chicago → Washington National
Timetable, Chicago time
15:00AA 4170 from Oklahoma City at the gate
14:00UA 5618 to Washington National leaves the gate
23 h apart on the timetable, overnight
UA 5618 leaves 23 h after AA 4170 arrives on the timetable: more than half a day, so not a connection we count.