 TACV Cabo Verde Airlines, the national airline has been a monopoly carrier within the island archipelago (2007).It operates services from the main hub airports at Sal and Santiago to Boa Vista, Fogo, Maio, São Nicolau and São Vicente at frequencies ranging from thrice weekly to thrice daily.Air strips on the other islands of Brava and Santo Antão are closed (2007) and can only be reached by ferry services from other islands.