DL 973 then BR 665 at Atlanta
Boston → Atlanta → Anchorage
Timetable, Atlanta time
21:30DL 973 from Boston at the gate
18:45BR 665 to Anchorage leaves the gate
21 h 15 apart on the timetable, overnight
BR 665 leaves 21 h 15 after DL 973 arrives on the timetable: more than half a day, so not a connection we count.