UA 3922 then AA 4005 at O'Hare
Savannah → Chicago → Madison
Timetable, Chicago time
02:36UA 3922 from Savannah at the gate
19:00AA 4005 to Madison leaves the gate
16 h 24 apart on the timetable
AA 4005 leaves 16 h 24 after UA 3922 arrives on the timetable: more than half a day, so not a connection we count.