UA 574 then WN 1716 at San Francisco
Boston → San Francisco → Phoenix
Timetable, San Francisco time
12:49UA 574 from Boston at the gate
05:50WN 1716 to Phoenix leaves the gatealso QF 4864
17 h 01 apart on the timetable, overnight
WN 1716 leaves 17 h 01 after UA 574 arrives on the timetable: more than half a day, so not a connection we count.