TK 9588 then B6 1234 at San Francisco
Portland (Oregon) → San Francisco → Boston
Timetable, San Francisco time
15:15TK 9588 from Portland (Oregon) at the gate
14:50B6 1234 to Boston leaves the gate
23 h 35 apart on the timetable, overnight
B6 1234 leaves 23 h 35 after TK 9588 arrives on the timetable: more than half a day, so not a connection we count.