this every year since then. Volaris announced the creation of a subsidiary, Volaris Costa Rica, in March 2016. The subsidiary, based at Juan Santamaría International Airport in the Costa Rican capital of San José, started operations in November 2016. International operations In November 2008, Volaris announced a codeshare agreement with U.S.-based low-cost carrier Southwest Airlines. In April 2009, Volaris announced the start of U.S.-bound flights out of Toluca and Guadalajara (initially to Los Angeles and Oakland) to feed into the hubs of Southwest Airlines. Later on, U.S. flights were also offered from Zacatecas and Morelia, with Monterrey-Los Angeles and Fresno in planning. On December 13, 2010, Volaris started services between Chicago/Midway and Guadalajara. It was Volaris' fourth international destination, first international service to a secondary airport and the longest route in Volaris' history. After Mexicana de Aviación's shutdown, Volaris took over many of Mexicana's international destinations and flights from its focus city, Guadalajara. On February 25, 2011, it was announced that Volaris would begin service to Fresno on April 14, 2011. Fresno was Volaris' first US destination where it did not partner with Southwest Airlines. The airline began using Guadalajara International Airport as an American gateway hub in late 2011. Volaris sought permission to fly between Dallas/Fort Worth and Mexico City, along with a number of other U.S.-Mexico routes. Volaris submitted the request on February 3, 2011 and the U.S. Department of Transportation granted approval on February 11. However, Volaris did not launch the service until over four years later, on April 29, 2015, when it began flights between Dallas/Fort Worth and Guadalajara. Volaris received approval to fly to San Diego International Airport on July 12, 2012. Volaris then began non-stop flights between Orlando and Guadalajara on July 14, 2012. Volaris started service between Sacramento and Guadalajara on November 15, 2012. Volaris began flights between Denver and Mexico City on December 8, 2012. On February 22, 2013, Volaris and Southwest stopped codesharing. Southwest decided to focus more on the Mexican market with AirTran Airways, instead of codesharing with Volaris. Volaris began flights between Phoenix and Guadalajara on October 19, 2013. Volaris began flying to its first destination in Texas, San Antonio, from Guadalajara on December 14, 2013. Volaris also started its new route from Mexico City to San Antonio on September 15, 2017. Volaris began non-stop flights between Chicago/O'Hare and Mexico City on December 17, 2013. This replaced Volaris' Chicago/Midway-Mexico