PROMOTION AND COMMUNICATION ACTIONS THROUGH THE SYSTEM OF SARDINIAN AIRPORTS (CAGLIARI, ALGHERO AND OLBIA) TO COMPLETE THE PANEL OF COMMUNICATION CHANNELS PRESENT ON THE TERRITORY IN LINE WITH THE STRATEGY OF SMART SPECIALISATION (S3) AND IN CONTINUITY WITH THE PROCESS OF STRATEGIC REPOSITIONING OF THE TERRITORIAL ECONOMIC PRODUCT LAUNCHED IN 2015/2016 STARTING FROM A NEW VISION OF THE ISLAND AND ALSO FOCUSING ON STRATEGIES OF SEASONALISATION USEFUL FOR THE LENGTHENING OF THE TOURIST SEASON, AS WELL AS TO CONSOLIDATE THE STRATEGIES EXPERIMENTED IN THE LAST THREE YEARS, INTENDED TO DRAW THE ATTENTION OF TOURISTS ON NEW TRAVEL MOTIVATIONS AND OTHER HOLIDAY THEMES, WITH THE AIM OF INCREASING THE NUMBER OF REPEATERS AND TO OBTAIN A SIGNIFICANT EFFECT ON POLICIES.