UA 1031 then DL 670 at San Francisco
Cleveland → San Francisco → New York JFK
Timetable, San Francisco time
11:00UA 1031 from Cleveland at the gatealso VA 8488, NZ 9045
23:05DL 670 to New York JFK leaves the gatealso AM 4305, VS 4848, LA 6189, KQ 7055
12 h 05 apart on the timetable
DL 670 leaves 12 h 05 after UA 1031 arrives on the timetable: more than half a day, so not a connection we count.