B6 948 then DL 667 at JFK
Las Vegas → New York → San Francisco
Timetable, New York time
06:59B6 948 from Las Vegas at the gate
19:00DL 667 to San Francisco leaves the gate
12 h 01 apart on the timetable
DL 667 leaves 12 h 01 after B6 948 arrives on the timetable: more than half a day, so not a connection we count.