AA 9928 then UA 2499 at O'Hare
New York LaGuardia → Chicago → Los Angeles
Timetable, Chicago time
06:45AA 9928 from New York LaGuardia at the gate
20:11UA 2499 to Los Angeles leaves the gate
13 h 26 apart on the timetable
UA 2499 leaves 13 h 26 after AA 9928 arrives on the timetable: more than half a day, so not a connection we count.