An example of the security threats facing this industry is the 9/11 terror attacks, which highlighted the desire and ability of enemies to generate considerable harm to the United States. Therefore, aviation security is increasingly important in order to protect the country and its citizens from such attacks. According to Federal of American Scientists 2007, aviation security is realized through combination of private and public aviation security activities across the globe. These activities are then coordinated to detect, prevent, deter, and defeat threats that…… This researcher rejects the existence of online communities because computer mediated group discussions cannot possibly meet this definition. Weinreich's view is that anyone with even a basic knowledge of sociology understands that information exchange in no way constitutes a community. For a cyber place with an associated computer mediated group to be labeled as a virtual settlement it is necessary for it to meet a minimum set of conditions.
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Subscribers to a home security service are usually assigned an alarm device that allows them to turn the service on or off as needed.