Improving amount of people at present tend to be keen on travelling. It is indicated by the fact that, above all, more and more enterprises guarantee us opportunities to visit foreign countries in pretty interesting price. Therefore, the percentage of people, who have at least once travelled with an airplane has substantially grown throughout recent years. It is indicated by the fact that miscellaneous carriers such as for instance Ryanair, Wizzair, Lufthansa etc. offer from time to time tickets in a pretty interesting prize.