DL 2709 then UA 3917 at Houston
Atlanta → Houston → Austin
Timetable, Houston time
13:23DL 2709 from Atlanta at the gate
07:30UA 3917 to Austin leaves the gate
18 h 07 apart on the timetable, overnight
UA 3917 leaves 18 h 07 after DL 2709 arrives on the timetable: more than half a day, so not a connection we count.