AA 6187 then AA 1408 at DFW
Montrose → Dallas-Fort Worth → Huatulco
Timetable, Dallas-Fort Worth time
15:53AA 6187 from Montrose at the gate
10:49AA 1408 to Huatulco leaves the gate
18 h 56 apart on the timetable, overnight
AA 1408 leaves 18 h 56 after AA 6187 arrives on the timetable: more than half a day, so not a connection we count.