CZ 1646 then UA 751 at San Francisco
Charlotte → San Francisco → Las Vegas
Timetable, San Francisco time
16:51CZ 1646 from Charlotte at the gatealso AA 2569, QF 4507
16:50UA 751 to Las Vegas leaves the gatealso AC 4104, VA 8191, NZ 9226
23 h 59 apart on the timetable, overnight
UA 751 leaves 23 h 59 after CZ 1646 arrives on the timetable: more than half a day, so not a connection we count.