Inhaltsangabe:Abstract: The contestability hypothesis has extensively been tested for the liberalised US airline markets. Entry barriers render US airline markets non-contestable. However, these studies do not allow an empirically based conclusion whether entry barriers are differently effective in preventing entry. Moreover, since previous studies exhibit no intra-firm perspective, they cannot ascertain whether a particular entry impediment prevents entry equally effective irrespective of potential entrant's characteristics. Comparable studies about the recently liberalised European airline markets are not available. This study fills these gaps by investigating European airline managers' perception of entry barriers. It turn out that some barriers are perceived to be significantly more effective than others. The perception of the effectiveness of a certain entry barrier, however, varies considerably among airline managers. Airlines' and respondents' characteristics contribute to explain this variance. Einleitung: Diese Arbeit untersucht mit Hilfe einer eigenen erhobenen empirischen Basis die Existenz von Markteintrittsbarrieren im europ?ischen Passagierluftverkehr nach dessen vollst?ndiger Liberalisierung im Jahre 1997. Als Markteintrittsbarrieren werden alle Charakteristika eines an sich gewinntr?chtigen Streckenmarktes betrachtet, die eine Fluggesellschaft davon abhalten, in diesen Markt einzutreten. Folgende Forschungsfragen werden beantwortet: - Welche Ma...