AA 1852 then AA 2451 at Miami
Washington National → Miami → San José (Costa Rica)
Timetable, Miami time
10:57AA 1852 from Washington National at the gate
10:55AA 2451 to San José (Costa Rica) leaves the gate
23 h 58 apart on the timetable, overnight
AA 2451 leaves 23 h 58 after AA 1852 arrives on the timetable: more than half a day, so not a connection we count.