BR 646 then UA 4502 at O'Hare
Anchorage → Chicago → Chattanooga
Timetable, Chicago time
17:10BR 646 from Anchorage at the gate
14:29UA 4502 to Chattanooga leaves the gate
21 h 19 apart on the timetable, overnight
UA 4502 leaves 21 h 19 after BR 646 arrives on the timetable: more than half a day, so not a connection we count.