JU 8510 then Y4 2243 at San Francisco
New York JFK → San Francisco → Dallas-Fort Worth
Timetable, San Francisco time
23:54JU 8510 from New York JFK at the gate
23:47Y4 2243 to Dallas-Fort Worth leaves the gatealso F9 2930
23 h 53 apart on the timetable, overnight
Y4 2243 leaves 23 h 53 after JU 8510 arrives on the timetable: more than half a day, so not a connection we count.