CV 251 then AA 3974 at O'Hare
Anchorage → Chicago → Harrisburg
Timetable, Chicago time
19:00CV 251 from Anchorage at the gate
10:35AA 3974 to Harrisburg leaves the gate
15 h 35 apart on the timetable, overnight
AA 3974 leaves 15 h 35 after CV 251 arrives on the timetable: more than half a day, so not a connection we count.