BR 646 then UA 1634 at O'Hare
Anchorage → Chicago → Savannah
Timetable, Chicago time
17:10BR 646 from Anchorage at the gate
12:25UA 1634 to Savannah leaves the gate
19 h 15 apart on the timetable, overnight
UA 1634 leaves 19 h 15 after BR 646 arrives on the timetable: more than half a day, so not a connection we count.