AA 1478 then UA 3917 at Houston
Charlotte → Houston → Austin
Timetable, Houston time
12:46AA 1478 from Charlotte at the gate
07:30UA 3917 to Austin leaves the gate
18 h 44 apart on the timetable, overnight
UA 3917 leaves 18 h 44 after AA 1478 arrives on the timetable: more than half a day, so not a connection we count.