AA 9928 then AA 1854 at O'Hare
New York LaGuardia → Chicago → San Francisco
Timetable, Chicago time
06:45AA 9928 from New York LaGuardia at the gate
19:00AA 1854 to San Francisco leaves the gate
12 h 15 apart on the timetable
AA 1854 leaves 12 h 15 after AA 9928 arrives on the timetable: more than half a day, so not a connection we count.