Tourism plays an important role in the Portuguese economy. According to figures from the World Economic Forum (WEF), Portugal was the 14th most competitive country in the tourism sector in 2017. In 2017, Portugal was visited by nearly 42 million tourists, four times the size of the Portuguese population. Their presence generated revenues worth more than 15 million Euros and contributed to an increase of 7% in employment levels. Additionally, tourism represents 18% of Portuguese exports. In this context, one cannot dissociate tourism from the growth of air transport in Portugal, which in 2018 registered an increase of more than 5% of movements and an increase of more than 7% of passengers.