DL 514 then AA 3376 at Phoenix
Boston → Phoenix → Denver
Timetable, Phoenix time
21:53DL 514 from Boston at the gate
13:16AA 3376 to Denver leaves the gate
15 h 23 apart on the timetable, overnight
AA 3376 leaves 15 h 23 after DL 514 arrives on the timetable: more than half a day, so not a connection we count.