Improving amount of people these days tend to be keen on travelling. It is proved by the fact that, firstly, increasing amount of enterprises provide us possibilities to visit foreign countries in relatively attractive price. Hence, the percentage of people, who have at least once travelled with an airplane has significantly increased throughout recent years. It is indicated by the fact that diverse carriers such as inter alia Ryanair, Wizzair, Lufthansa etc. provide from time to time tickets in a pretty affordable prize.