KCI Airport has nonstop routes to three international countries: Iceland, Mexico and Canada. See which airlines serve these routes. Foreign countries may have special procedures and regulations for travelers flying there. Please check your airline's website for specific details. The following government links may also be helpful to you...
Transportation and Security Administration (TSA)
U.S. Customs and Border Protection
U.S. Embassy and Consulates in Mexico
Canada Border Services Agency
Iceland Directorate of Customs