Following an agreement with the trade unions, 49% of the Spanish state air traffic management company Aena Aeropuertos will be sold off before the summer break. No official estimate of the company's value has yet been made but the Spanish media suggest the state might raise €9 billion from the sale. Three options are being studied - selling off 49% of the company on the stock exchange, allowing only institutions to invest in the company or a combination of the two. Calls for tender for...