St. John's is served by St. John's International Airport (YYT), located 10 minutes northwest of the downtown core. In 2011, roughly 1,400,000 passengers travelled through the airport making it the second busiest airport in Atlantic Canada in passenger volume. Regular destinations include Halifax, Montreal, Ottawa, Toronto, as well as destinations throughout the province. International locations include Dublin, London, New York City, Saint Pierre and Miquelon, Glasgow and Varadero. Scheduled service providers include Air Canada, Air Canada Jazz, Air Saint-Pierre, Air Transat, United Airlines, Porter Airlines, Provincial Airlines, Sunwing Airlines and Westjet.

Answer this question, if possible (if impossible, reply "unanswerable"): What is the airport code for St. John's International Airport?
YYT