JU 8510 then UA 301 at San Francisco
New York JFK → San Francisco → Denver
Timetable, San Francisco time
23:54JU 8510 from New York JFK at the gate
21:24UA 301 to Denver leaves the gatealso AC 3598, VA 8346, NZ 9055
21 h 30 apart on the timetable, overnight
UA 301 leaves 21 h 30 after JU 8510 arrives on the timetable: more than half a day, so not a connection we count.