The characteristics of the tourist market are conditioned by the involvement of tourist mediators in the process of connecting tourist consumers and producers. Tour operators, along with travel agencies, are the most prominent mediators in the tourist market.Their business is based on the lease of a large number of accommodation and transport facilities, and the creation of a specific tourist product, a package deal that is payable at a lump-sum price.The lump-sum price is usually lower than the sum of the individual prices which the consumer can make to reserve and pay the individual services. By creating package deals at affordable prices, tour operators are most creditablefor tourism being developed as a mass phenomenon. However, today tour operators are the carriers of the most significant processes of concentration and integration in the tourist market, one of the initiator of innovations on the tourist market but also the promoters of the concept of sustainability in the business of tourism subjects. This can easily be perceived as a feature of one of the most significant tour operators today, the TUI Group.