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

Context articles: Manor of D. Violante do Canto
Graciosa
Rallye Açores
Bay of Angra
Blue Air
Convent of São Francisco (Angra do Heroísmo)
Faial Island
João Paulo II Airport
Ryanair
Hermitage of São Vicente (São Roque do Pico)

The Manor of D. Violante do Canto (Portuguese: "Solar de D. Violante do Canto" ), commonly known as the "House of Dona Violante do Canto" (Portuguese: "Casa de D. Violante do Canto" ), is an urban manorhouse located in the civil parish of Sé , municipality of Angra do Heroísmo, in the Portuguese island of Terceira, archipelago of the Azores.
Graciosa Island (] ) (literally "graceful" or "enchanting" in Portuguese) is referred to as the "White Island", the northernmost of the Central Group of islands in the Azores.
 The ovular Portuguese island has an area of 60.65 km2 , a length of 10 km and a width of 7 km .
 It is a volcanic island, dominated by a 1.6 km central caldera (the Caldeira) located in the southeast.
The Rallye Açores, known originally as the Volta à Ilha de São Miguel is an international rally racing event based on the Portuguese island of São Miguel Island in the Azores.
 The event has been a long running round of the European Rally Championship and the Portuguese Rally Championship as well as spawning its own championship in the Azores.
 It has also in the recent past been a round of the Intercontinental Rally Challenge and the ERC derivative series, the European Rally Cup West.
 Unlike other international events held on Atlantic Ocean islands that it is frequently paired with, the Rali Vinho da Madeira and the Rally Islas Canarias it is a gravel event.
Bay of Angra (Portuguese: "Baía de Angra" ) is a natural bay within the coastal extent of the municipality of Angra do Heroísmo, on the Portuguese island of Terceira in the archipelago of the Azores.
 Within an average depth of 40 m , the bay has been of historical importance to the island; since the 15th century, it was a port-of-call for returning merchant shipping from the East Indies and Brazil, laden with gold, silver, porcelain, spices, rare woods, and other goods.
 These ships would anchor in the Bay of Angra until supported by armed escorts, which would accompany the ships on the rest of their voyage to Portugal.
 The Bay at Angra provided shelter from northern and northwestern winds; only storms originating to the south or southeast, posed a threat.
 Nonetheless, the Bay is the final resting-place of several ships affected by the adverse winds: local archives and a rich oral tradition supports the foundering of many ships against the leeward shore.
Blue Air is an airline headquartered in Bucharest, with its main hubs at Henri Coandă International Airport and Turin Airport.
 Since 2016, it has become the largest Romanian airline by scheduled passengers flown.
 In 2016, Blue Air carried 3.6 million passengers, a significant increase over the 2 million passengers flown the previous year.
 As of May 2017, Blue Air flies to 70 destinations.
 Despite operating as a low-cost airline, Blue Air started introducing free sandwiches and drinks on-board shorter flights, and a full hot meal, snacks, hot/cold and alcoholic beverages on longer flights.
 This is considered unheard of in the low-cost sector, particularly as traditionally 'full service' carriers such as British Airways controversially removed free meals, snacks and drinks in 2017, and is considered key to Blue Air's continued success.
The Convent of São Francisco is a Baroque-era convent and church in the historical centre of the city of Angra, civil parish of Sé, municipality of Angra do Heroísmo on the Portuguese island of Terceira, in the archipelago of the Azores.
 Better recognizable for the large "Church of Our Lady of the Guide" (Portuguese: "Igreja de Nossa Senhora da Guia" ), is its locally known as the "Igreja do Convento de São Francisco", ("Church of the Convent of São Francisco"), one of the largest of Christian temples in the Azores, and former seat of the Franciscan Province of São João Evangelista, during the Age of Discovery.
Faial Island (] ), also known in English as Fayal, is a Portuguese island of the Central Group (Portuguese: "Grupo Central") of the Azores.
 The Capelinhos Volcano, the westernmost point of the island, might as well be the westernmost point of Europe, if the Monchique Islet, near Flores Island, is considered part of North America, for it sits on the North American Plate.
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.
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 )
The Hermitage of São Vicente (Portuguese: "Ermida de São Vicente" ) is an early settlement hermitage in the locality of São Vicente, civil parish of Santo António, in the Portuguese municipality of São Roque do Pico, on the Portuguese island of Pico, in the archipelago of the Azores.