UA 574 then WN 4104 at Phoenix
Boston → Phoenix → San Diego
Timetable, Phoenix time
19:31UA 574 from Boston at the gate
19:30WN 4104 to San Diego leaves the gate
23 h 59 apart on the timetable, overnight
WN 4104 leaves 23 h 59 after UA 574 arrives on the timetable: more than half a day, so not a connection we count.