UA 5668 then BR 643 at O'Hare
Pittsburgh → Chicago → Anchorage
Timetable, Chicago time
11:45UA 5668 from Pittsburgh at the gate
11:25BR 643 to Anchorage leaves the gate
23 h 40 apart on the timetable, overnight
BR 643 leaves 23 h 40 after UA 5668 arrives on the timetable: more than half a day, so not a connection we count.