UA 535 then UA 3917 at Houston
Chicago → Houston → Austin
Timetable, Houston time
12:28UA 535 from Chicago at the gate
07:30UA 3917 to Austin leaves the gate
19 h 02 apart on the timetable, overnight
UA 3917 leaves 19 h 02 after UA 535 arrives on the timetable: more than half a day, so not a connection we count.