UA 1970 then UA 2436 at San Francisco
Cleveland → San Francisco → Denver
Timetable, San Francisco time
21:45UA 1970 from Cleveland at the gatealso VA 8489, NZ 9046, OZ 9526
18:35UA 2436 to Denver leaves the gatealso AC 5416, VA 8341, NZ 9062
20 h 50 apart on the timetable, overnight
UA 2436 leaves 20 h 50 after UA 1970 arrives on the timetable: more than half a day, so not a connection we count.