Together with the fast evolving technology, innovation in many areas to facilitate human life is ongoing. Especially in the field of transportation, aviation sector has reached a large number of passenger-carrying capacity with these developments throughout the world in a short time. Of course, these developments and innovations are not sufficient to completely disappearance of some negativity. In this study, aviation accidents and flight blocker events (incident in-flight) were examined in detail for The European Union member countries (28 countries) and the candidate countries (5 countries) to between the years 2005 to 2014 (within a 10 year period). In this examination on the information obtained from the site of Aviation Safety Network, aviation accidents and flight blocker events can be classified under headings such as pilot errors, technical problems, communication problems with tower and pilot and meteorology. In this regard, within this period for the European region in further study, accidents and flight broker events evaluated. The percentage of accidents and flight broker event factors for 193 cases was found; technical problems 40 %, pilot errors 31 %, meteorology 15 %, fire 6 %, passengers originating 4 %, communication problems with tower 2 %, other reasons 2 %. In addition, 527 people lost their lives in this 10-year period.