CX 7854 then AC 3994 at San Francisco
Seattle → San Francisco → Boise
Timetable, San Francisco time
20:47CX 7854 from Seattle at the gate
18:30AC 3994 to Boise leaves the gatealso UA 5644, NZ 9398
21 h 43 apart on the timetable, overnight
AC 3994 leaves 21 h 43 after CX 7854 arrives on the timetable: more than half a day, so not a connection we count.