B6 394 then DL 797 at Boston
Denver → Boston → Seattle
Timetable, Boston time
18:50B6 394 from Denver at the gate
18:42DL 797 to Seattle leaves the gate
23 h 52 apart on the timetable, overnight
DL 797 leaves 23 h 52 after B6 394 arrives on the timetable: more than half a day, so not a connection we count.