AA 1618 then BR 643 at O'Hare
Dallas-Fort Worth → Chicago → Anchorage
Timetable, Chicago time
15:19AA 1618 from Dallas-Fort Worth at the gate
11:55BR 643 to Anchorage leaves the gate
20 h 36 apart on the timetable, overnight
BR 643 leaves 20 h 36 after AA 1618 arrives on the timetable: more than half a day, so not a connection we count.