G7 3375 then DL 2503 at O'Hare
St Louis → Chicago → New York LaGuardia
Timetable, Chicago time
08:23G7 3375 from St Louis at the gate
20:25DL 2503 to New York LaGuardia leaves the gate
12 h 02 apart on the timetable
DL 2503 leaves 12 h 02 after G7 3375 arrives on the timetable: more than half a day, so not a connection we count.