Question: On which Portuguese island has the largest European airline by scheduled passengers flown had a base since 2015?
Sentence (from "João Paulo II Airport"): 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.
Relevant evidence: No