UA 2335 then DL 1697 at Phoenix
Denver → Phoenix → Boston
Timetable, Phoenix time
19:55UA 2335 from Denver at the gate
14:20DL 1697 to Boston leaves the gate
18 h 25 apart on the timetable, overnight
DL 1697 leaves 18 h 25 after UA 2335 arrives on the timetable: more than half a day, so not a connection we count.