DL 1421 then KL 7451 at San Francisco
Los Angeles → San Francisco → New York JFK
Timetable, San Francisco time
08:58DL 1421 from Los Angeles at the gatealso LY 4095, VS 4109, KE 7217, MU 8848
21:35KL 7451 to New York JFK leaves the gatealso MU 8703
12 h 37 apart on the timetable
KL 7451 leaves 12 h 37 after DL 1421 arrives on the timetable: more than half a day, so not a connection we count.