UA 3874 then AA 1233 at O'Hare
Chicago Rockford → Chicago → Orlando
Timetable, Chicago time
01:21UA 3874 from Chicago Rockford at the gate
14:51AA 1233 to Orlando leaves the gate
13 h 30 apart on the timetable
AA 1233 leaves 13 h 30 after UA 3874 arrives on the timetable: more than half a day, so not a connection we count.