GF 6631 then DL 747 at JFK
London Heathrow → New York → Los Angeles
Timetable, New York time
13:15GF 6631 from London Heathrow at the gate
11:00DL 747 to Los Angeles leaves the gate
21 h 45 apart on the timetable, overnight
DL 747 leaves 21 h 45 after GF 6631 arrives on the timetable: more than half a day, so not a connection we count.