AA 506 then UA 5618 at O'Hare
Charlotte → Chicago → Washington National
Timetable, Chicago time
14:23AA 506 from Charlotte at the gate
14:00UA 5618 to Washington National leaves the gate
23 h 37 apart on the timetable, overnight
UA 5618 leaves 23 h 37 after AA 506 arrives on the timetable: more than half a day, so not a connection we count.