UA 574 then WN 1722 at Phoenix
Boston → Phoenix → Las Vegas
Timetable, Phoenix time
19:31UA 574 from Boston at the gate
18:20WN 1722 to Las Vegas leaves the gate
22 h 49 apart on the timetable, overnight
WN 1722 leaves 22 h 49 after UA 574 arrives on the timetable: more than half a day, so not a connection we count.