F9 2791 then AA 3851 at O'Hare
Orlando → Chicago → Chattanooga
Timetable, Chicago time
08:46F9 2791 from Orlando at the gate
21:00AA 3851 to Chattanooga leaves the gate
12 h 14 apart on the timetable
AA 3851 leaves 12 h 14 after F9 2791 arrives on the timetable: more than half a day, so not a connection we count.