DL 514 then WN 284 at Phoenix
Boston → Phoenix → Denver
Timetable, Phoenix time
21:53DL 514 from Boston at the gate
17:10WN 284 to Denver leaves the gate
19 h 17 apart on the timetable, overnight
WN 284 leaves 19 h 17 after DL 514 arrives on the timetable: more than half a day, so not a connection we count.