DL 1697 then UA 2400 at Boston
Phoenix → Boston → San Francisco
Timetable, Boston time
21:00DL 1697 from Phoenix at the gate
18:01UA 2400 to San Francisco leaves the gate
21 h 01 apart on the timetable, overnight
UA 2400 leaves 21 h 01 after DL 1697 arrives on the timetable: more than half a day, so not a connection we count.