| http://www.w3.org/ns/prov#value | - Air traffic control is complex at its three basic levels???over big regions (e.g., all of California and the Pacific Ocean), over local areas (e.g., the 50-mile radius that includes airports at San Francisco, Oakland and San Jose) and around a specific tower, such as the one at San Francisco International Airport that in busy times may orchestrate one landing per minute, Tomlin said.
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