UA 1729 then DL 1697 at Phoenix
Newark → Phoenix → Boston
Timetable, Phoenix time
21:37UA 1729 from Newark at the gate
14:20DL 1697 to Boston leaves the gate
16 h 43 apart on the timetable, overnight
DL 1697 leaves 16 h 43 after UA 1729 arrives on the timetable: more than half a day, so not a connection we count.