UA 574 then DL 2442 at Phoenix
Boston → Phoenix → Seattle
Timetable, Phoenix time
19:31UA 574 from Boston at the gate
18:36DL 2442 to Seattle leaves the gate
23 h 05 apart on the timetable, overnight
DL 2442 leaves 23 h 05 after UA 574 arrives on the timetable: more than half a day, so not a connection we count.