UA 1481 then DL 514 at Phoenix
Denver → Phoenix → Boston
Timetable, Phoenix time
09:49UA 1481 from Denver at the gate
23:23DL 514 to Boston leaves the gate
13 h 34 apart on the timetable
DL 514 leaves 13 h 34 after UA 1481 arrives on the timetable: more than half a day, so not a connection we count.