OS 7717 then AC 4370 at San Francisco
Chicago O'Hare → San Francisco → Reno
Timetable, San Francisco time
18:56OS 7717 from Chicago O'Hare at the gatealso SN 8819
18:55AC 4370 to Reno leaves the gate
23 h 59 apart on the timetable, overnight
AC 4370 leaves 23 h 59 after OS 7717 arrives on the timetable: more than half a day, so not a connection we count.