Sardinia the highest internet performances, such as fastest broadband connection in Italy. Sardinia is also the Italian region with the highest percentage (41%) of 4G LTE users. The Chinese multinational telecommunications equipment and systems companies ZTE and Huawei have development centers and innovation labs in Sardinia. Sardinia has become Europe's first region to fully adopt the new Digital Terrestrial Television broadcasting standard. From 1 November 2008 TV channels are broadcast only in digital. Sardinia has three international airports (Alghero-Fertilia/Riviera del Corallo Airport, Olbia-Costa Smeralda Airport and Cagliari-Elmas Airport) connected with the principal Italian cities and many European destinations, mainly in the
Sardinia Sardinia. Thus Sardinia is probably the only European country where feudalism was introduced in the transition period from the Middle Ages to the early modern period, at a time when feudalism had already been abandoned by many other European countries. In 1469, the heir to Sardinia, Ferdinand II of Aragon, married Isabel of Castile, and the "Kingdom of Sardinia" (which was separated from Corsica) was to be inherited by their Habsburg grandson, Charles I of Spain, with the state symbol of the Four Moors. The successors of Charles I of Spain, in order to defend their Mediterranean territories from raids