CV 251 then AA 1968 at O'Hare
Anchorage → Chicago → Tucson
Timetable, Chicago time
19:00CV 251 from Anchorage at the gate
11:40AA 1968 to Tucson leaves the gate
16 h 40 apart on the timetable, overnight
AA 1968 leaves 16 h 40 after CV 251 arrives on the timetable: more than half a day, so not a connection we count.