Who's coming to Costa Rica?

Some sale fares I saw on American Airlines this morning (it's in Spanish though it seems pretty self-explanatory):

Link

HACIA COSTA RICA
Tarifa: SLXSA6D
De Los Ángeles, CA
a Liberia, CR
$554

Reserve Ahora
De NYC/LaGuardia, NY
a Liberia, CR
$500

Reserve Ahora
De Orlando, FL
a Liberia, CR
$540

Reserve Ahora
De Washington Dulles, DC
a Liberia, CR
$460

Reserve Ahora
De Cleveland, OH
a San José, CR
$490

Reserve Ahora
De Denver, CO
a San José, CR
$465

Reserve Ahora
De San Francisco
a San José, CR
$500

Reserve Ahora