UA 1970 then UA 930 at San Francisco
Cleveland → San Francisco → London
Timetable, San Francisco time
21:45UA 1970 from Cleveland at the gatealso VA 8489, NZ 9046, OZ 9526
16:40UA 930 to London leaves the gatealso LX 3049, AC 5376, OS 7858, SN 9100, LH 9379
18 h 55 apart on the timetable, overnight
UA 930 leaves 18 h 55 after UA 1970 arrives on the timetable: more than half a day, so not a connection we count.