AA 2607 then AA 5418 at DFW
Miami → Dallas-Fort Worth → Harlingen
Timetable, Dallas-Fort Worth time
09:30AA 2607 from Miami at the gate
21:48AA 5418 to Harlingen leaves the gate
12 h 18 apart on the timetable
AA 5418 leaves 12 h 18 after AA 2607 arrives on the timetable: more than half a day, so not a connection we count.