UA 1272 then AC 4370 at San Francisco
Mexico City → San Francisco → Reno
Timetable, San Francisco time
21:02UA 1272 from Mexico City at the gatealso AC 3480, NZ 9820
20:40AC 4370 to Reno leaves the gate
23 h 38 apart on the timetable, overnight
AC 4370 leaves 23 h 38 after UA 1272 arrives on the timetable: more than half a day, so not a connection we count.