Continental Portugal's  territory is serviced by four international airports located near the principal cities of Lisbon, Porto, Faro and Beja. Lisbon's geographical position makes it a stopover for many foreign airlines at several airports within the country. The primary flag-carrier is TAP Air Portugal, although many other domestic airlines provide services within and without the country. The government decided to build a new airport outside Lisbon, in Alcochete, to replace Lisbon Portela Airport, though this plan has been suspended due to austerity measures. Currently, the most important airports are in Lisbon, Porto, Faro, Funchal (Madeira), and Ponta Delgada (Azores), managed by the national airport authority group ANA – Aeroportos de Portugal. One other important airport is the Aeroporto Internacional das Lajes on the island of Terceira in the Azores. This airport serves as one of two international airports serving countries outside the European Union for all nine islands of the Azores. It also serves as a military air base for the United States Air Force. The base remains in use to the present day.