UA 1970 then UA 1453 at San Francisco
Cleveland → San Francisco → Washington
Timetable, San Francisco time
21:45UA 1970 from Cleveland at the gatealso VA 8489, NZ 9046, OZ 9526
16:52UA 1453 to Washington leaves the gatealso VA 8383, NZ 9169
19 h 07 apart on the timetable, overnight
UA 1453 leaves 19 h 07 after UA 1970 arrives on the timetable: more than half a day, so not a connection we count.