Question: On which Portuguese island has the largest European airline by scheduled passengers flown had a base since 2015?

full_context: Document 1: CityJet: CityJet is an Irish regional airline with headquarters in Swords, County Dublin. It operates its own scheduled services out of London City Airport and to a lesser extent Dublin Airport, where it has maintenance facilities. The airline also operates wet-lease services on behalf of Air France (until October 2017), Scandinavian Airlines and Brussels Airlines. Air France sold CityJet to "Intro Aviation" in May 2014. In March 2016 the airline was bought by founder Pat Byrne and other investors.
Document 2: Aer Lingus Regional: Aer Lingus Regional is an Aer Lingus brand used for commuter and regional flights operated by Irish airline Stobart Air on behalf of Aer Lingus. Aer Lingus Regional operates scheduled passenger services primarily from Ireland to the UK, France and the Channel Islands. Its bases are located at Cork and Dublin airports.
Document 3: Dublin Airport: Dublin Airport, (Irish: Aerfort Bhaile Átha Cliath ) (IATA: DUB, ICAO: EIDW) , is an international airport serving Dublin, the capital city of Ireland. It is operated by DAA (formerly Dublin Airport Authority). The airport is located 5.4 nmi north of Dublin in Collinstown, Fingal. In 2016, 27.9 million passengers passed through the airport, making it the airport's busiest year on record. It is the 15th busiest airport in Europe, and is also the busiest of the state's airports by total passenger traffic. It has the greatest traffic levels on the island of Ireland, followed by Belfast International Airport, County Antrim.
Document 4: Dublin Airport: Dublin Airport, (Irish: Aerfort Bhaile Átha Cliath ) (IATA: DUB, ICAO: EIDW) , is an international airport serving Dublin, the capital city of Ireland. It is operated by DAA (formerly Dublin Airport Authority). The airport is located 5.4 nmi north of Dublin in Collinstown, Fingal. In 2016, 27.9 million passengers passed through the airport, making it the airport's busiest year on record. It is the 15th busiest airport in Europe, and is also the busiest of the state's airports by total passenger traffic. It has the greatest traffic levels on the island of Ireland, followed by Belfast International Airport, County Antrim.
Document 5: Isle of Man Airport: Isle of Man Airport (also known as Ronaldsway Airport, Manx: Purt Aer Vannin) (IATA: IOM, ICAO: EGNS) , is the main civilian airport on the Isle of Man. It is located in the south of the island at Ronaldsway near Castletown, 6 NM southwest of Douglas, the island's capital. Along with the Isle of Man Sea Terminal, it is one of the two main gateways to the island. The airport has scheduled services to the United Kingdom and the Republic of Ireland as well as seasonal routes to Switzerland.
Document 6: Lajes Field: Lajes Field or Lajes Air Base (] ; Portuguese: "Base Aérea das Lajes" ), officially designated Air Base No. 4 ("Base Aérea Nº 4", BA4) (IATA: TER, ICAO: LPLA) , is a multi-use airfield, home to the Portuguese Air Force "Base Aérea N º4" and Azores Air Zone Command (Portuguese: "Comando da Zona Aérea dos Açores" ), a United States Air Force detachment unit (operated by the 65th Air Base Group of United States Air Forces in Europe - Air Forces Africa), and a regional air passenger terminal located near Lajes and 15 km northeast of Angra do Heroísmo on Terceira Island in the Azores, Portugal. Located about 3680 km east of New York City and about 1600 km west of Lisbon, Portugal; the base sits in a strategic location midway between North America and Europe in the north Atlantic Ocean.
Document 7: Cristiano Ronaldo International Airport: Cristiano Ronaldo Madeira International Airport, also known as Madeira Airport (Portuguese: "Aeroporto da Madeira" ), or Funchal Airport ("Aeroporto do Funchal" ) (IATA: FNC, ICAO: LPMA) , is an international airport in the civil parish of Santa Cruz, in the Portuguese archipelago and autonomous region of Madeira. The airport is located 13.2 km east-northeast of the regional capital Funchal after which it is sometimes informally named. It mostly hosts flights to European metropolitan destinations due to the importance of Madeira as a leisure destination, and is pivotal in the movement of cargo in and out of the archipelago of Madeira. It is the fourth busiest airport in Portugal.
Document 8: Stobart Air: Stobart Air, legally incorporated as "Stobart Air Unlimited Company" and formerly named Comhfhobairt (Gaillimh) and trading under the business name Aer Arann, is an Irish regional airline headquartered in Dublin. It operates scheduled services under the brands Aer Lingus Regional and Flybe on behalf of their respective owners. Stobart Air has operating bases at Cork and Dublin for Aer Lingus Regional and at London-Southend and Isle of Man for Flybe.
Document 9: Pula Airport: Pula Airport (IATA: PUY, ICAO: LDPL) is the international airport serving Pula, Croatia, and is located 6 km from the city center. It served 436,121 passengers in 2016. The airport is designated as the alternative airport for parts of Slovenia and a multitude of cities in eastern Italy. The airport also attracts jet set passengers flying privately or rented aircraft, visiting the Brijuni islands or attending concerts and shows at the Pula Arena and sailing their yachts. Pula airport is currently capable of handling large wide-body aircraft such as the Boeing 747 and Ilyushin Il-96.
Document 10: Ryanair: Ryanair Ltd. (/raɪə'ner/) is an Irish low-cost airline founded in 1984, headquartered in Swords, Dublin, Ireland, with its primary operational bases at Dublin and London Stansted airports. In 2016, Ryanair was the largest European airline by scheduled passengers flown, and carried more international passengers than any other airline. (, , NASDAQ: RYAAY )
Document 11: Frankfurt Airport: Frankfurt Airport (IATA: FRA, ICAO: EDDF) (German: "Flughafen Frankfurt am Main" , also known as "Rhein-Main-Flughafen") is a major international airport located in Frankfurt, the fifth-largest city of Germany and one of the world's leading financial centres. It is operated by Fraport and serves as the main hub for Lufthansa including Lufthansa CityLine and Lufthansa Cargo as well as Condor and AeroLogic. The airport covers an area of 4942 acres of land and features two passenger terminals with a capacity of approximately 65 million passengers per year, four runways and extensive logistics and maintenance facilities.
Document 12: Malta International Airport: Malta International Airport (Maltese: "Ajruport Internazzjonali ta' Malta" , IATA: MLA, ICAO: LMML ) is the only airport in Malta and it serves the whole of the Maltese Islands. It is located on island of Malta, between Luqa and Gudja, and occupies the location of the former RAF Luqa. It was completely refurbished, becoming fully operational on 25 March 1992. It is still referred to by locals as Luqa Airport, and sometimes as Valletta Airport internationally, as it is located 5 km southwest of the Maltese capital Valletta. The airport serves as the main hub for Air Malta and a base for Ryanair. It is also home to the Area Control Center and hosts the annual Malta Airshow, visited by military and civil aircraft from various European and other countries. The airport is operated by Malta International Airport plc.
Document 13: Tony Ryan: He was a founder of Guinness Peat Aviation (GPA) as well as co-founder of Ryanair with Christy Ryan and Liam Lonergan. Ryanair was believed to be the main source of his wealth in later life: the company is now one of the biggest airlines in Europe and is valued at over 10 billion US dollars as of 2012.
Document 14: João Paulo II Airport: João Paulo II Airport (IATA: PDL, ICAO: LPPD) , named after Pope John Paul II, is an international airport located on the island of São Miguel, in the Portuguese archipelago of the Azores. Situated 2 km west of the city centre of Ponta Delgada, it is the primary (and busiest) airport in the Azores, as well as the fifth largest infrastructure managed by ANA Aeroportos de Portugal; with the construction of the terminal in 1995, by 2005 the airport served a total of 873,500 passengers. It has scheduled domestic flights to all islands of the Azores, plus Madeira and the mainland, namely (Lisbon, Porto and Faro). João Paulo II Airport also accommodates international flights to and from Europe and North America. The airport is the major hub for the SATA Group of airlines, which includes both inter-island SATA Air Açores and international Azores Airlines, and since April 2015 as a base for Ryanair.
Document 15: Jacksons International Airport: Jacksons International Airport (IATA: POM, ICAO: AYPY) , also known as Port Moresby Airport, is located 8 kilometres (5 miles) outside Port Moresby, in Papua New Guinea. It is the largest and busiest airport in Papua New Guinea and is the main hub for Air Niugini, the national airline of Papua New Guinea, as well as the main hub for PNG Air and Travel Air. It replaced the original Port Moresby airport, in what is now the suburb of Waigani, whose airstrip remained until the 1990s but no trace of which is now there, it having been built over.
ground_truth: São Miguel