AA 9928 then UA 2106 at O'Hare
New York LaGuardia → Chicago → San Francisco
Timetable, Chicago time
06:45AA 9928 from New York LaGuardia at the gate
21:57UA 2106 to San Francisco leaves the gate
15 h 12 apart on the timetable
UA 2106 leaves 15 h 12 after AA 9928 arrives on the timetable: more than half a day, so not a connection we count.