Nope, not 30. The US only has 12 aircraft carriers, CV/CVN (10 nuc and 2 oil-burners) and for budget reasons are considering retiring one of the older oil-burners (the JFK) in this fiscal year.
We also have 12 other ships, LHA/LHD that 'look' like carriers because of their flight deck, however they are just amphibious assault ships. They carry helos and a few Harrier VTOL type attack aircraft.
We had a large Navy under Reagan, it has been shrinking ever since...
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Ah...thx for the info.