CM 2457 then AA 2253 at San Francisco
Sacramento → San Francisco → Chicago O'Hare
Timetable, San Francisco time
21:41CM 2457 from Sacramento at the gatealso AC 4533, UA 5961, VA 8183
17:27AA 2253 to Chicago O'Hare leaves the gatealso QF 4756
19 h 46 apart on the timetable, overnight
AA 2253 leaves 19 h 46 after CM 2457 arrives on the timetable: more than half a day, so not a connection we count.