DL 514 then AC 1720 at Phoenix
Boston → Phoenix → Toronto
Timetable, Phoenix time
21:53DL 514 from Boston at the gate
13:50AC 1720 to Toronto leaves the gate
15 h 57 apart on the timetable, overnight
AC 1720 leaves 15 h 57 after DL 514 arrives on the timetable: more than half a day, so not a connection we count.