AN MD80 PARKED AT A DFW RAMP EXIT HOLDING POINT LOWERED FLAPS ONTO A RAMP BAGGAGE CART THAT HAD BROKEN LOOSE FROM TUG.

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WITH AN INOP APU; WE STARTED BOTH ENGS AT GATE AND WERE PUSHED BACK AT XA05. RAMP CLRED US FOR A R TURN TO EXIT SPOT X. WE TURNED OUT TO THE R AND STOPPED AT SPOT X; SHORT OF TXWY. WHILE WAITING TO EXIT SPOT X; WE SELECTED FLAPS 6 DEGS. WHILE STATIONARY AT SPOT X; WE HEARD AND FELT A SLIGHT BUMP OF SOME KIND. THE YELLOW SLAT DISAGREE LIGHT CAME ON AND ON MY COMMAND; THE FO RETRACTED THE FLAPS. ABOUT THAT TIME; GND PERSONNEL CAME OUT AND MOTIONED AND YELLED TO US TO SHUT DOWN. FLT ATTENDANT CALLED THE COCKPIT AND SAID A BAGGAGE CART WAS WEDGED UNDER THE R FLAP. WE SHUT DOWN BOTH ENGS AND I MADE A PA TO THE CABIN. AFTER GND PERSONNEL AND MAINT SHOT PICTURES; CHKED THE ACFT; AND REMOVED THE BAGGAGE CART OR CARTS; WE WERE TOWED TO THE GATE WHERE SHIP WENT OTS BECAUSE OF DAMAGE TO THE TRAILING EDGE OF THE R INBOARD FLAP. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THE CARTS WHICH COLLIDED WITH THE ACFT HAD NOT BEEN PROPERLY ATTACHED TO THE TUG AND HAD SUBSEQUENTLY BECOME DETACHED FROM THE TUG. BY PURE CHANCE; THE FLAPS WERE BEING LOWERED JUST AS THE CARTS ROLLED UNDER THE ACFT'S R WING.