The thesis deals with the issue of cooperation amongst air carriers. There are mentioned several forms of cooperation in this field: bilateral agreements, global airline alliances and also very specific and current ways of cooperation which are mergers and acquisitions. The last mentioned forms are illustrated on specific examples of important European airlines which decided to improve their competitiveness by joining other air carrier or acquiring relevant stake in other airline. The trend of concentration in the aviation area has naturally affected Czech air transport market as well; therefore this thesis includes a separate chapter concerning acquisition of Czech Airlines by Korean Air which bought a 44 % stake in Czech flag air carrier....