Due to the limited capacity of San Diego's Lindbergh Field and its lack of room for expansion, travelers from that area have often used other airports, including Tijuana’s Abelardo L. Rodriguez International Airport, which is across the border in Mexico. Due to a joint venture by American and Mexican businesses, residents of the U.S. will be able to park their cars in a lot on the American side of the border, and then walk directly to the Mexican airport. In order to do so, they will need to have an airline ticket, in addition to normal documents such as a passport.
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It will be interesting to see how this arrangement will work for American residents outside of the San Diego area who wish arrive by way of Tijuana's airport, or even if it will be available to such travelers. But if everything works out, perhaps car rental facilities could be provided on the American side, so that American travelers won't have to rent a car from Mexico to be used in the United States.