AA 764 then UA 4645 at O'Hare
Houston → Chicago → Fort Wayne
Timetable, Chicago time
11:58AA 764 from Houston at the gate
11:25UA 4645 to Fort Wayne leaves the gate
23 h 27 apart on the timetable, overnight
UA 4645 leaves 23 h 27 after AA 764 arrives on the timetable: more than half a day, so not a connection we count.