AA 5454 then BR 643 at O'Hare
Dayton → Chicago → Anchorage
Timetable, Chicago time
11:59AA 5454 from Dayton at the gate
11:55BR 643 to Anchorage leaves the gate
23 h 56 apart on the timetable, overnight
BR 643 leaves 23 h 56 after AA 5454 arrives on the timetable: more than half a day, so not a connection we count.