AA 1329 then UA 2071 at O'Hare
Jacksonville → Chicago → Boston
Timetable, Chicago time
08:15AA 1329 from Jacksonville at the gate
20:30UA 2071 to Boston leaves the gate
12 h 15 apart on the timetable
UA 2071 leaves 12 h 15 after AA 1329 arrives on the timetable: more than half a day, so not a connection we count.