UA 297 then BR 643 at O'Hare
Baltimore → Chicago → Anchorage
Timetable, Chicago time
13:54UA 297 from Baltimore at the gate
11:55BR 643 to Anchorage leaves the gate
22 h 01 apart on the timetable, overnight
BR 643 leaves 22 h 01 after UA 297 arrives on the timetable: more than half a day, so not a connection we count.