Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
Q: Context: It is part of the Icelandair Group and, during the summer of 2015, operated scheduled services to 39 cities in 16 countries on both sides of the Atlantic Ocean out of its hub at Keflavik International Airport.
Question: Which airline hub does Icelandair operate out of?
A:
keflavik international airport