WN 2851 then DL 514 at Phoenix
Denver → Phoenix → Boston
Timetable, Phoenix time
11:05WN 2851 from Denver at the gate
23:23DL 514 to Boston leaves the gate
12 h 18 apart on the timetable
DL 514 leaves 12 h 18 after WN 2851 arrives on the timetable: more than half a day, so not a connection we count.