European Union representation within those institutions, a practice often referred to as "pooling of sovereignty". To become a member, a country must meet the Copenhagen criteria, defined at the 1993 meeting of the European Council in Copenhagen. These require a stable democracy that respects human rights and the rule of law; a functioning market economy; and the acceptance of the obligations of membership, including EU law. Evaluation of a country's fulfilment of the criteria is the responsibility of the European Council. No member state has yet left the Union, although Greenland (an autonomous province of Denmark) withdrew in 1985. Article 50 of
Air Greenland need to make more than one flight for each connection to a fixed-wing flight because of passenger capacity, causing longer total travel time. Air Greenland also performs charter flights within Europe on behalf of European travel agencies using its Airbus A330. In 2015, the decision voted by Greenland's governments to extend the runways of Nuuk and Ilulissat airports directly threatened the purpose of Air Greenland's single widebody aircraft. The A330 was only used from Pituffik and Kangerlussuaq to Copenhagen Kastrup, but in January 2017, Air Greenland had announced more commercial routes to be covered by the aircraft between Iceland and