PHOENIX (AP) -- Phoenix Sky Harbor International Airport is welcoming a new airline that will operate direct flights to two cities in Mexico. Officials say Volaris, the largest Mexican low-cost airline, will fly nonstop, three times a week from Phoenix to Mexico City and Phoenix to Guadalajara beginning later this year. Details on exact days and times have not yet been released. Volaris CEO Enrique Beltranena and Phoenix Mayor Greg Stanton say the new flights will strengthen economic ties and bolster tourism. Sky Harbor currently offers nonstop flights to 20 international cities, including several daily flights to Guadalajara and Mexico City. Volaris also serves airports in California, Colorado, Nevada, Illinois and Florida.