The Porto/ Francisco de Sá Carneiro Airport / Pedras Rubras (OPO), between the municipalities of Maia, Matosinhos,and Vila do Conde, is also one of its greater investments. It was transformed from an old and obsolete airport to a modern transportation centre, linked to Porto Metro. The JMP is also trying to pressure the government to add a TGV line to link Vigo in Galicia to Porto Airport in order to make Porto the air traffic centre of the North-Western Iberian Peninsula and to tighten its historical ties with that Spanish province.