AC 4121 then DL 668 at San Francisco
Ontario → San Francisco → New York JFK
Timetable, San Francisco time
17:50AC 4121 from Ontario at the gate
11:50DL 668 to New York JFK leaves the gatealso LY 4440, VS 4762, LA 6225, KL 7260
18 h apart on the timetable, overnight
DL 668 leaves 18 h after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.