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Two aircraft carriers, USS John C. Stennis (left), and HMS Illustrious (right), showing the difference in size between a supercarrier and a typical aircraft carrier.
An aircraft carrier is a warship whose main role is to deploy and recover aircraft. Aircraft carriers thus allow a naval force to project air power great distances without having to depend on local bases for land-based aircraft. Modern navies, who operate such ships, treat aircraft carriers as the centerpiece of the fleet, a role previously played by the battleship. The change, part of the growth of air power as a significant part of warfare, took place during World War II. Unescorted carriers are considered vulnerable to missile attack and therefore travel as part of a carrier battle group.
Aircraft carriers are generally the largest ships operated by navies; a Nimitz-class carrier powered by two nuclear reactors and four steam turbines is 1092 ft (333 m) long and costs about $5 billion. The United States has the majority of aircraft carriers with over a dozen in service, and its aircraft carriers are a cornerstone of American power projection capability.
Nine countries maintain aircraft carriers: United StatesThe United States of America also referred to as the United States U. America ¹ or the States is a federal republic in central North America, stretching from the Atlantic in the east to the Pacific Ocean in the west. It shares land borders with Canada in, FranceThe French Republic or France ( French: Republique francaise or France is a country whose metropolitan territory is located in western Europe, and which is further made up of a collection of overseas islands and territories located in other continents., IndiaThe Republic of India is a large multicultural country in South Asia, with a population of over one billion. The Indian economy is the fourth largest in the world, in terms of purchasing power parity, and is the world's second-fastest growing economy., RussiaThe Russian Federation ( Russian: , transliteration: Rossiyskaya Federatsiya or Rossijskaja Federacija , or Russia (Russian: , transliteration: Rossiya or Rossija , is a country that stretches over a vast expanse of eastern Europe and northern Asia. With, SpainThe Kingdom of Spain is a country located in the southwest of Europe. It shares the Iberian Peninsula with Portugal, Gibraltar and Andorra. To the northeast, along the Pyrenees mountain range, it borders France and the tiny principality of Andorra. It inc, BrazilThis article is about Brazil, the country. For other article subjects named Brazil see Brazil (disambiguation). The Federative Republic of Brazil Republica Federativa do Brasil in Portuguese) is the largest and most populous country in South America., ItalyThe Italian Republic or Italy ( Italian: Italia is a country in the south of Europe, consisting mainly of a boot-shaped peninsula together with two large islands in the Mediterranean Sea: Sicily and Sardinia. To the north, where it borders France, Switzer, ThailandThe Kingdom of Thailand is a country in southeast Asia, bordering Laos and Cambodia to the east, the Gulf of Thailand and Malaysia to the south, and the Andaman Sea and Myanmar to the west. Thailand is also known as Siam which was the country's official n, and the United Kingdom. In addition the People's Republic of China's People's Liberation Army Navy possesses the former Soviet aircraft carrier Varyag, but most naval analysts believe that they have no intention to operate it, but instead are using Varyag to learn about carrier operations for a future Chinese aircraft carrier.
