Cruzeiro do Sul Airport — Cruzeiro Do Sul, Brazil

CZS designates Cruzeiro do Sul Airport, serving an isolated city of the same name deep in Brazil's western Amazon, in Acre state near the Peruvian border. Cruzeiro do Sul sits along the Juruá River, surrounded by dense rainforest with almost no paved road connections to the rest of Brazil, which makes CZS a genuine lifeline rather than a convenience — nearly all passenger travel, mail, and many goods reach the city by air. Flights typically connect through Rio Branco, Acre's state capital, on regional jet or turboprop service. The airport's runway and terminal reflect its critical role for a remote Amazonian population otherwise cut off for much of the rainy season.