TK 9588 then UA 1593 at San Francisco
Portland (Oregon) → San Francisco → Houston
Timetable, San Francisco time
10:55TK 9588 from Portland (Oregon) at the gate
23:15UA 1593 to Houston leaves the gatealso EK 6028, NZ 9192
12 h 20 apart on the timetable
UA 1593 leaves 12 h 20 after TK 9588 arrives on the timetable: more than half a day, so not a connection we count.