BR 642 then UA 2844 at O'Hare
Anchorage → Chicago → St Louis
Timetable, Chicago time
11:55BR 642 from Anchorage at the gate
10:45UA 2844 to St Louis leaves the gate
22 h 50 apart on the timetable, overnight
UA 2844 leaves 22 h 50 after BR 642 arrives on the timetable: more than half a day, so not a connection we count.