It is not possible to eliminate all aviation disasters and acts of terror. The impact of such events are relevant and extremely harmful. For the markets, just to list some of the effects, these include economic slowdown, higher unemployment and tangible losses. Whereas for aviation companies the worst thing that follows such an event is an income decrease. Moreover, tragic accidents in aviation cause an increasing amount of total costs. The main aim of this article is to present the consequences of aviation disasters and acts of terror for markets and aviation companies. The article also presents an objective level of probability of such events.