MU 8665 then DL 977 at San Francisco
New York JFK → San Francisco → Boston
Timetable, San Francisco time
22:38MU 8665 from New York JFK at the gate
13:00DL 977 to Boston leaves the gatealso KE 6731
14 h 22 apart on the timetable, overnight
DL 977 leaves 14 h 22 after MU 8665 arrives on the timetable: more than half a day, so not a connection we count.