WN 1751 then DL 514 at Phoenix
Denver → Phoenix → Boston
Timetable, Phoenix time
07:00WN 1751 from Denver at the gate
23:23DL 514 to Boston leaves the gate
16 h 23 apart on the timetable
DL 514 leaves 16 h 23 after WN 1751 arrives on the timetable: more than half a day, so not a connection we count.