UA 6 then UA 3917 at Houston
Tokyo Narita → Houston → Austin
Timetable, Houston time
14:50UA 6 from Tokyo Narita at the gate
07:30UA 3917 to Austin leaves the gate
16 h 40 apart on the timetable, overnight
UA 3917 leaves 16 h 40 after UA 6 arrives on the timetable: more than half a day, so not a connection we count.