American Airlines began an eight-year program to build the largest passenger terminal at JFK, designed to replace both Terminal 8 and Terminal 9. The new terminal was built in four phases, which involved the construction of a new midfield concourse, demolition of the old Terminal 9, and finally demolition of the old Terminal 8. It opened in stages between 2005 and its "official" opening in August 2007. It is a major Oneworld hub, and American Airlines is the major Oneworld carrier at Terminal 8. In addition to operations at Terminal 7, some Oneworld airlines including Finnair operate out of Terminal 8.