AA 777 then AA 6238 at DFW
Las Vegas → Dallas-Fort Worth → Amarillo
Timetable, Dallas-Fort Worth time
20:20AA 777 from Las Vegas at the gate
08:25AA 6238 to Amarillo leaves the gate
12 h 05 apart on the timetable, overnight
AA 6238 leaves 12 h 05 after AA 777 arrives on the timetable: more than half a day, so not a connection we count.