DL 1697 then UA 2348 at Boston
Phoenix → Boston → Denver
Timetable, Boston time
21:00DL 1697 from Phoenix at the gate
09:20UA 2348 to Denver leaves the gate
12 h 20 apart on the timetable, overnight
UA 2348 leaves 12 h 20 after DL 1697 arrives on the timetable: more than half a day, so not a connection we count.