BA 7546 then OZ 6303 at San Francisco
Las Vegas → San Francisco → Chicago O'Hare
Timetable, San Francisco time
17:41BA 7546 from Las Vegas at the gate
17:10OZ 6303 to Chicago O'Hare leaves the gate
23 h 29 apart on the timetable, overnight
OZ 6303 leaves 23 h 29 after BA 7546 arrives on the timetable: more than half a day, so not a connection we count.