TK 9588 then UA 2391 at San Francisco
Portland (Oregon) → San Francisco → Cincinnati
Timetable, San Francisco time
15:15TK 9588 from Portland (Oregon) at the gate
12:15UA 2391 to Cincinnati leaves the gatealso NZ 2853
21 h apart on the timetable, overnight
UA 2391 leaves 21 h after TK 9588 arrives on the timetable: more than half a day, so not a connection we count.