Terceira, however, has one big attraction for Beijing: Air Base No. 4. Better known as Lajes Field, the facility where Premier Wen’s 747 landed in June is jointly operated by the U.S. Air Force and its Portuguese counterpart. If China controlled the base, the Atlantic would no longer be secure. From the 10,865-foot runway on the northeast edge of the island, Chinese planes could patrol the northern and central portions of the Atlantic and thereby cut air and sea traffic between the U.S. and Europe. Beijing would also be able to deny access to the nearby Mediterranean Sea.