DL 2140 then UA 3917 at Houston
New York LaGuardia → Houston → Austin
Timetable, Houston time
10:14DL 2140 from New York LaGuardia at the gate
07:30UA 3917 to Austin leaves the gate
21 h 16 apart on the timetable, overnight
UA 3917 leaves 21 h 16 after DL 2140 arrives on the timetable: more than half a day, so not a connection we count.