AA 4504 then UA 1706 at O'Hare
South Bend → Chicago → Phoenix
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
14:10UA 1706 to Phoenix leaves the gate
19 h 35 apart on the timetable, overnight
UA 1706 leaves 19 h 35 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.