UA 511 then UA 4772 at O'Hare
Washington National → Chicago → Columbia Regional
Timetable, Chicago time
14:26UA 511 from Washington National at the gate
12:45UA 4772 to Columbia Regional leaves the gate
22 h 19 apart on the timetable, overnight
UA 4772 leaves 22 h 19 after UA 511 arrives on the timetable: more than half a day, so not a connection we count.