UA 3922 then AA 4494 at O'Hare
Savannah → Chicago → Harrisburg
Timetable, Chicago time
02:36UA 3922 from Savannah at the gate
16:20AA 4494 to Harrisburg leaves the gate
13 h 44 apart on the timetable
AA 4494 leaves 13 h 44 after UA 3922 arrives on the timetable: more than half a day, so not a connection we count.