DL 346 then B6 1396 at Atlanta
Denver → Atlanta → Boston
Timetable, Atlanta time
16:39DL 346 from Denver at the gate
16:30B6 1396 to Boston leaves the gate
23 h 51 apart on the timetable, overnight
B6 1396 leaves 23 h 51 after DL 346 arrives on the timetable: more than half a day, so not a connection we count.