AA 9928 then AA 1212 at O'Hare
New York LaGuardia → Chicago → Boston
Timetable, Chicago time
06:45AA 9928 from New York LaGuardia at the gate
19:13AA 1212 to Boston leaves the gate
12 h 28 apart on the timetable
AA 1212 leaves 12 h 28 after AA 9928 arrives on the timetable: more than half a day, so not a connection we count.