DL 939 then B6 603 at JFK
Los Angeles → New York → Vancouver
Timetable, New York time
20:59DL 939 from Los Angeles at the gate
18:17B6 603 to Vancouver leaves the gate
21 h 18 apart on the timetable, overnight
B6 603 leaves 21 h 18 after DL 939 arrives on the timetable: more than half a day, so not a connection we count.