UA 1668 then DL 670 at San Francisco
Austin → San Francisco → New York JFK
Timetable, San Francisco time
11:01UA 1668 from Austin at the gatealso AC 4796, VA 8474, NZ 9116
23:05DL 670 to New York JFK leaves the gatealso AM 4305, VS 4848, LA 6189, KQ 7055
12 h 04 apart on the timetable
DL 670 leaves 12 h 04 after UA 1668 arrives on the timetable: more than half a day, so not a connection we count.