Puerto Jiménez Airport is a tiny airstrip, but it changes the whole rhythm of an Osa Peninsula trip. Flying from San José can save most of a day compared with the bus-and-road approach, which matters if your real goal is Corcovado.
Facilities are minimal, and baggage limits on small planes can be strict. Treat the airport as a practical tool rather than an attraction, and keep weather delays in mind during the rainy season.