CM 1131 then AA 597 at San Francisco
Eugene → San Francisco → Chicago O'Hare
Timetable, San Francisco time
21:11CM 1131 from Eugene at the gatealso AV 2270
17:22AA 597 to Chicago O'Hare leaves the gatealso QF 4712
20 h 11 apart on the timetable, overnight
AA 597 leaves 20 h 11 after CM 1131 arrives on the timetable: more than half a day, so not a connection we count.