A new airport terminal that extends from the U.S. to Mexico will open for business on Wednesday.

Air travelers will now be able to pay $18 to walk through a 390-foot overpass that goes from San Diego to the Tijuana International Airport.

According to The Associated Press, a group of investors, including Chicago billionaire Sam Zell, have built the terminal with the hopes of accommodating the estimated 60 percent of Tijuana airport passengers who cross into the United States to make their flights.

The cross-country attempt to make air travel easier for Mexicans as well as U.S. citizens is historic, as the only other cross-border airport is in the European Union, between Switzerland and France's Upper Rhine region.

Daniela Calderon, a frequent flyer from Tijuana praised the terminal as a time saver.

"It seems so much easier, so liberating," Calderon said.

However liberating the new Cross Border Xpress ends up being for passengers on both sides of the border the creation of the airport is wholly serendipitous.

The Tijuana Airport, which opened in 1951, was constructed a few feet away from the international border and happened to be surrounded by plenty of undeveloped San Diego land. Stanis Smith, the architect behind the project, calls the terminal an accident of geography.

"It could never happen again," he said.

Carlos Laviada, an investor in the project, said the project will transform the border crossing experience for millions of travelers.

According to Business Wire, he said, “We started the planning and approvals for CBX over eight years ago, and it has garnered incredible support on both sides of the border."

According to Laviada, inter-country travel is a critical economic driver for both nations.

The new terminal is located along the border in San Diego, between the San Ysidro and Otay Mesa border crossings.