AA 1878 then AA 1408 at DFW
Salt Lake City → Dallas-Fort Worth → Huatulco
Timetable, Dallas-Fort Worth time
15:23AA 1878 from Salt Lake City at the gate
10:49AA 1408 to Huatulco leaves the gate
19 h 26 apart on the timetable, overnight
AA 1408 leaves 19 h 26 after AA 1878 arrives on the timetable: more than half a day, so not a connection we count.