UA 1970 then EK 6420 at San Francisco
Cleveland → San Francisco → Houston
Timetable, San Francisco time
21:45UA 1970 from Cleveland at the gatealso VA 8489, NZ 9046, OZ 9526
18:35EK 6420 to Houston leaves the gatealso NH 6492, VA 8081, NZ 9199
20 h 50 apart on the timetable, overnight
EK 6420 leaves 20 h 50 after UA 1970 arrives on the timetable: more than half a day, so not a connection we count.