B6 1901 then DL 747 at JFK
Buffalo → New York → Los Angeles
Timetable, New York time
13:35B6 1901 from Buffalo at the gate
11:00DL 747 to Los Angeles leaves the gate
21 h 25 apart on the timetable, overnight
DL 747 leaves 21 h 25 after B6 1901 arrives on the timetable: more than half a day, so not a connection we count.