While landing at Kos Airport (LGKO) on runway 33, the PIC performed a long flare with a high nose position, which resulted in the aircraft’s tail skid and the lower rear part of the fuselage centre section coming into contact with the runway. At runway contact, the tail skid assembly was compressed within the permissible limitations and major damage of approximately 1.5 x 0.5 metres occurred. During a subsequent inspection of the aircraft by the PIC and co-pilot, the damage to the fuselage was not detected. The aircraft returned to ESGG without further incident. At ESGG the damage was discovered by a technician during an inspection of the aircraft. PRN: ON LANDING, AFT FUSELAGE AND TAIL-SKID CONTACTED THE runway AS A RESULT OF OVER ROTATION. AFT FUSELAGE BOTTOM SKIN WAS DAMAGED FROM STATION 867 TO STATION 927. TAIL-SKID WAS WITHIN LIMITS.