According to DHMI statistics, a total of 1,829,028 airplane (including passenger aircraft, freight aircraft and commercial aircraft) and 173,959,159 passengers were transported at. Turkish airports in 2016. The forecast for 2019 is about 25 percent more than these figures . Vulnerabilities in the communication protocol used in Auto-Dependent Surveillance (ADS-B), the most important unit of NextGen, called the new generation flight control system in aircraft traffic where exists such high numbers, present dangerous risks for both civilian and military flights. In this study, the security analysis of ADS-B technology is presented to the reader by classifying it according to attack types. A number of methods have been described comparatively to make ADS-B technology secure, and comments on its applicability have been made.