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In page History of Cape Verde:

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Espargos, in the centre of the island of Sal was founded in the late 1940s as the last Portuguese airport town. From 1950 to 1970, the number of flights increased. Espargos became an important stop for Alitalia's Portuguese-Brazilian flights and South African Airways' (SAA) 1967 flights between London and Johannesburg. The airline had to use the airport because to the international boycott of South Africa due to its apartheid policy.[citation needed]