10 of them are in the US Navy. Only the Russians have ever built anything close to the capabilities of the USN "Nimitz" class. Russia has one of them in service, the other was sold partially completed to the Chicoms, who finished it and put it in service. USN, even in its current degraded state under the Communist Mohammedan Usurper, is more navy than the rest of the world combined.
bump
Not too many countries need or can afford a big aircraft carrier. You would need to at least be a regional power for it to make any sense.