BR 646 then UA 5815 at O'Hare
Anchorage → Chicago → Lexington
Timetable, Chicago time
17:10BR 646 from Anchorage at the gate
10:35UA 5815 to Lexington leaves the gate
17 h 25 apart on the timetable, overnight
UA 5815 leaves 17 h 25 after BR 646 arrives on the timetable: more than half a day, so not a connection we count.