There has been talk for years, in fact, there has been numerous articles in The Tico Times, La Nacion and others, that have said the new international airport in the Southern Pacific zone is going to be built soon.
Here is what La Nacion stated in Aug 2008:
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The Technical Council of Civic Aviation allocated $20
million to improve landing strips and set up fences at seven airports. Four
local terminals, Nosara, Puerto Jimenez, Parismina and Tortuguero, and the
international ones at Limon, Pavas and Liberia will benefit from the
program. On the other hand, the Civil Aviation Bureau will receive this month
the master plan for the new international airport in the South Pacific, which
will be located at Sierpe, Osa, and whose construction will be launched next
year"