AA 4504 then UA 2290 at O'Hare
South Bend → Chicago → Dallas-Fort Worth
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
13:30UA 2290 to Dallas-Fort Worth leaves the gate
18 h 55 apart on the timetable, overnight
UA 2290 leaves 18 h 55 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.