At the Mexico-U.S. Border, a bridge at the Tijuana Airport has been one of the first in the world to span two countries. A new terminal was unveiled in San Diego on Wednesday that is connected to the airport by a pedestrian cross-border bridge nearly 120 meters long. Now San Diego travelers can walk to the Tijuana Airport. This crossing is free until December 18. After that date there will be a one-way $18 fee. teleSUR