UA 571 then AI 174 at San Francisco
Atlanta → San Francisco → Kolkata
Timetable, San Francisco time
11:24UA 571 from Atlanta at the gatealso VA 8403, NZ 9005
11:00AI 174 to Kolkata leaves the gate
23 h 36 apart on the timetable, overnight
AI 174 leaves 23 h 36 after UA 571 arrives on the timetable: more than half a day, so not a connection we count.