Introduction After the terrorist attack of September 11, 2001, the federal government responded through the enactment of legislations that were aimed at making airports secure and increasing air passenger safety. In this regard, President Bush signed into law the ATSA (Aviation and Transportation Security Act) under the Transportation Security Administration (TSA) that aimed to consolidate security efforts, and it was mandated to deliver several changes in security procedures in the aviation sector. Changes that were initiated included enhanced customer and luggage screening at all commercial airports. All these were aimed at ensuring passenger safety and restoration of confidence in the United States aviation system, and the overall effect of the new regulations was to ensure passenger satisfaction in services provided by the aviation sector. The aim of this study was to investigate changes and developments associated with airport security systems after 9/11, and the impact of these new security systems on passengers’ satisfaction. Background to the Project The tragic events of September 11, 2001 have changed the way in which the American citizens viewed their safety forever. Insecurity rates sharply increased after the infamous attack, making people abandon air transportation for quite a while. Even nowadays, after the hysteria has subsided to a considerable extent, the fear for people’s lives still defines the measures used to ensure passengers’ safety. However, the increase in safety rates has also changed procedures that passengers undergo when checking in for their flights. Specifically, the time that the process of checking in and handing in the luggage typically takes has been extended for security reasons, which was bound to affect the satisfaction rates of the target audience. Although precaution measures used nowadays in airports are aimed only at increasing the passengers’ safety and promoting security, they also cause a gradual reduction in customer satisfaction rates because of the rise in the procedures’ duration and associated inconvenience (Hoffman & Reinares 2014). Passenger satisfaction has been an integral element in the aviation industry because greater confidence in passenger safety will increase demand for services. However, aviation specialists have noted that more time and effort are necessary from passengers, but such requirements could lead to low utilization of air travel because of inconvenience associated with security procedures (Williams & Waltrip 2004). Research Objectives   * To examine the development of aviation security changes since 9/11 attacks   * To identify different kinds of airport security   * To analyse the success of implementing new security systems   * To explore the improvements in the aviation safety   * To analyse the airport security impacts on passenger travel satisfaction   * To evaluate the future improvements of airport security and passenger safety Overview of this Report This is a lengthy report. This overview is intended to cover, section by section, the key areas of interest of the report. The research approach or methodology used was a deductive approach because it is based on pre-existing theory of aviation safety, which includes theory hypothesis, observations, and confirmation. In this research, a s