UA 576 then UA 5566 at O'Hare
Minneapolis → Chicago → Pittsburgh
Timetable, Chicago time
13:15UA 576 from Minneapolis at the gate
12:48UA 5566 to Pittsburgh leaves the gate
23 h 33 apart on the timetable, overnight
UA 5566 leaves 23 h 33 after UA 576 arrives on the timetable: more than half a day, so not a connection we count.