CZ 1604 then UA 552 at San Francisco
Los Angeles → San Francisco → Ontario
Timetable, San Francisco time
23:40CZ 1604 from Los Angeles at the gatealso AA 3176, AY 4048, QF 4743, EI 7533
21:20UA 552 to Ontario leaves the gatealso CM 1456
21 h 40 apart on the timetable, overnight
UA 552 leaves 21 h 40 after CZ 1604 arrives on the timetable: more than half a day, so not a connection we count.