AA 2527 then AA 3898 at DFW
Boston → Dallas-Fort Worth → Brownsville
Timetable, Dallas-Fort Worth time
09:38AA 2527 from Boston at the gate
21:40AA 3898 to Brownsville leaves the gate
12 h 02 apart on the timetable
AA 3898 leaves 12 h 02 after AA 2527 arrives on the timetable: more than half a day, so not a connection we count.