UA 3903 then VA 8080 at San Francisco
Seoul → San Francisco → Houston
Timetable, San Francisco time
08:46UA 3903 from Seoul at the gate
00:45VA 8080 to Houston leaves the gate
15 h 59 apart on the timetable, overnight
VA 8080 leaves 15 h 59 after UA 3903 arrives on the timetable: more than half a day, so not a connection we count.