AA 4504 then UA 5901 at O'Hare
South Bend → Chicago → Syracuse
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
18:20UA 5901 to Syracuse leaves the gate
23 h 45 apart on the timetable, overnight
UA 5901 leaves 23 h 45 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.