VA 8311 then KE 3471 at San Francisco
Boston → San Francisco → Detroit
Timetable, San Francisco time
12:09VA 8311 from Boston at the gate
11:58KE 3471 to Detroit leaves the gate
23 h 49 apart on the timetable, overnight
KE 3471 leaves 23 h 49 after VA 8311 arrives on the timetable: more than half a day, so not a connection we count.