DL 860 then UA 785 at San Francisco
Boston → San Francisco → Washington
Timetable, San Francisco time
13:51DL 860 from Boston at the gatealso WS 7646
06:15UA 785 to Washington leaves the gatealso AZ 4408, NZ 9160
16 h 24 apart on the timetable, overnight
UA 785 leaves 16 h 24 after DL 860 arrives on the timetable: more than half a day, so not a connection we count.