UA 367 then B6 616 at San Francisco
Washington → San Francisco → New York JFK
Timetable, San Francisco time
01:29UA 367 from Washington at the gatealso LH 7530, VA 8388, NZ 9181
22:56B6 616 to New York JFK leaves the gatealso EY 8046, EY 8242, EY 8246, JU 8513
21 h 27 apart on the timetable
B6 616 leaves 21 h 27 after UA 367 arrives on the timetable: more than half a day, so not a connection we count.