UA 6104 then AA 793 at O'Hare
South Bend → Chicago → Phoenix
Timetable, Chicago time
19:00UA 6104 from South Bend at the gate
10:10AA 793 to Phoenix leaves the gate
15 h 10 apart on the timetable, overnight
AA 793 leaves 15 h 10 after UA 6104 arrives on the timetable: more than half a day, so not a connection we count.