If you're on the AA flight out of Orlando, the flight # and times have changed to the following (highligted in red):

Leaving on May 12th:
American Airlines, Flight : 1483 Leaves ORL @ 9am; Arrives in Miami @ 9:55

American Airlines, Flight #2415
Leaves MIA @ 10:45am; Arrives in Punta Can @ 1:05pm

Coming Home:

Returning on May 19th:
American Airlines, Flight : 1732
Leaves Punta Cana @ 7:00 am; Arrives in Miami @ 9:30am

American Airlines, Flight # 2064
Leaves MIA @ 12:10pm; Arrives in ORL @ 1:10pm