Large companies have moved their headquarters to the city because of Curitiba's structure, its international airport, which serves the whole southern region (the Afonso Pena International Airport), its access to the Port of Paranaguá, and the junction of highways and railroads linking the south region directly to the southeast of the country. Many multinational automotive (car) companies are in Greater Curitiba, which makes Curitiba the second largest automotive center in the country. Curitiba is an important cultural, political, and economic center in the country.