AA 4504 then UA 2164 at O'Hare
South Bend → Chicago → Phoenix
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
11:08UA 2164 to Phoenix leaves the gate
16 h 33 apart on the timetable, overnight
UA 2164 leaves 16 h 33 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.