ollaborate over distance. With cellular telephones, people have more flexibility in both space and time. We can make appointments approximate and use our cell phones to call again when the time and place are closer, deciding exactly what we want to do. We can call our destinations when we are lost. Both radio location and being talked in for a landing used to be a process used only for airplanes. Now they are used routinely by drivers of delivery trucks and friends who cannot find our houses. 5 One clear illustration of this occurred on September 11, 2001. While cellular tele- phones are probably useful to terrorists, their use was certainly key to the courageous decision of the passengers and crew of the flight near Pittsburgh that foiled terrorists. They used their cellular phones to call family from the hijacked flight. The news of the World Trade Center had already reached some of the people they were calling, and peo- ple put information together from the news available at home or work and the situa- tion on the airplane allowed a collection of citizens to surmise that this was not an or- dinary hijacking. Supported not only by the information but by the human contact with 40ne of the authors (Kemp), thanks his wife, Kris Lindbeck, for this insight. 5The authors again thank Steven M. Kemp, Ph.D., for collaborating over distance in developing these ideas. Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. CDMA Now and in the Future CDMA Now and in the Future friends and family, the passengers and remaining crew apparently decided to prevent the hijackers from flying the plane into yet another building. Evidence indicates that they used a luggage cart to attack the cabin door. Whatever the hijackers' intentions were, they succeeded only in crashing the plane and not in destroying their target. This is one spectacular example of a phenomenon 