AC 4121 then LY 4571 at San Francisco
Ontario → San Francisco → Los Angeles
Timetable, San Francisco time
17:50AC 4121 from Ontario at the gate
12:05LY 4571 to Los Angeles leaves the gate
18 h 15 apart on the timetable, overnight
LY 4571 leaves 18 h 15 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.