In the hopes of preventing another terrorist attack like the ones of September 11, researchers at the University of California at Berkeley are developing an intelligent autopilot system for commercial aircraft. The system, dubbed Soft Walls, would activate whenever an aircraft approaches a designated no-fly zone. Using global positioning system technology, the autopilot would guide the plane around or away from restricted airspace. A few technical papers describing the Soft Walls concept and proposed implementation are available on its home page. For a more general overview of the project, several presentations and links to media coverage of Soft Walls are also provided.