This winter WestJet is launching two new routes to Florida, one to Mexico and one to Costa Rica, as well as adding more than 85 flights throughout its domestic and international networks. Additionally, WestJet Encore will launch three-times-daily service between Toronto and Boston.

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JetBlue Airways plans to introduce its Mint premium transcontinental service on its routes linking Boston with San Francisco, Los Angeles and Barbados. It also plans to launch services linking Nashville with Boston and Fort Lauderdale and increase service frequencies on 14 routes from Boston.

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Seattle-based Alaska Airlines, which began selling tickets on June 11 for its routes between Los Angeles and Costa Rica’s two major international airports, is offering introductory one-way fares of $249 from Los Angeles to San José and Liberia.

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Southwest Airlines is planning to launch international service from Houston Hobby Airport to eight cities in Mexico, Central America and the Caribbean this fall.

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Assuming it receives the required governmental approvals, Alaska Airlines will operate four weekly round-trips from Los Angeles to Costa Rica’s capital San Jose and also four round-trips to Liberia in Guanacaste province.

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Subject to government approvals, WestJet will add Antigua, Curaçao and Liberia in Costa Rica as new seasonal destinations, all to be served from Toronto Pearson International Airport; and Manzanillo in Mexico, to be served from Calgary International Airport.

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JetBlue Airways is planning to operate four weekly nonstop flights between New York’s John F. Kennedy International Airport and Liberia, Costa Rica’s Daniel Oduber Quirós International Airport from November 17, 2011, subject to government approval.

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