UA 3852 then AA 234 at San Francisco
Ontario → San Francisco → New York JFK
Timetable, San Francisco time
10:55UA 3852 from Ontario at the gate
07:21AA 234 to New York JFK leaves the gatealso QF 3288, GF 4132, BA 5603, G3 6439, RJ 7944, IB 8251, QR 8655
20 h 26 apart on the timetable, overnight
AA 234 leaves 20 h 26 after UA 3852 arrives on the timetable: more than half a day, so not a connection we count.