AA 1363 then UA 4821 at Houston
Charlotte → Houston → Amarillo
Timetable, Houston time
10:25AA 1363 from Charlotte at the gate
09:30UA 4821 to Amarillo leaves the gate
23 h 05 apart on the timetable, overnight
UA 4821 leaves 23 h 05 after AA 1363 arrives on the timetable: more than half a day, so not a connection we count.