AA 9928 then DL 1840 at O'Hare
New York LaGuardia → Chicago → Salt Lake City
Timetable, Chicago time
06:45AA 9928 from New York LaGuardia at the gate
19:15DL 1840 to Salt Lake City leaves the gate
12 h 30 apart on the timetable
DL 1840 leaves 12 h 30 after AA 9928 arrives on the timetable: more than half a day, so not a connection we count.