AA 9928 then UA 2071 at O'Hare
New York LaGuardia → Chicago → Boston
Timetable, Chicago time
06:45AA 9928 from New York LaGuardia at the gate
20:30UA 2071 to Boston leaves the gate
13 h 45 apart on the timetable
UA 2071 leaves 13 h 45 after AA 9928 arrives on the timetable: more than half a day, so not a connection we count.