UA 1970 then UA 1278 at San Francisco
Cleveland → San Francisco → Chicago O'Hare
Timetable, San Francisco time
21:45UA 1970 from Cleveland at the gatealso VA 8489, NZ 9046, OZ 9526
16:10UA 1278 to Chicago O'Hare leaves the gatealso AC 4674, NZ 9312
18 h 25 apart on the timetable, overnight
UA 1278 leaves 18 h 25 after UA 1970 arrives on the timetable: more than half a day, so not a connection we count.