AA 2633 then UA 3874 at O'Hare
Washington National → Chicago → LCQ
Timetable, Chicago time
09:11AA 2633 from Washington National at the gate
06:30UA 3874 to LCQ leaves the gate
21 h 19 apart on the timetable, overnight
UA 3874 leaves 21 h 19 after AA 2633 arrives on the timetable: more than half a day, so not a connection we count.