From SABRE:
4G*AA2125Y6JUNEWRMIA«
‡EQUIPMENT CHANGE IN PROGRESS‡
But availability says:
16JUNEWRMIA‡AA«
06JUN SUN EWR/EDT MIA/EDT‡0
1AA 2125 F7 A7 Y7 B7 K7*EWRMIA 8 1241P 334P AB6 L/ 0 DCA /E
M7 H7 Q7 W7 V7 G7 N7 L7 S7
So, I'm guessing they're switching the aircraft to/from an Airbus on this flight.