AA 644 then AA 6238 at DFW
Salt Lake City → Dallas-Fort Worth → Amarillo
Timetable, Dallas-Fort Worth time
10:45AA 644 from Salt Lake City at the gate
08:25AA 6238 to Amarillo leaves the gate
21 h 40 apart on the timetable, overnight
AA 6238 leaves 21 h 40 after AA 644 arrives on the timetable: more than half a day, so not a connection we count.