Purpose The purpose of this study is to identify the impact of human and structural capital on profitability of major airlines and examine whether region, capital ownership and control and strategic alliance play a clustering effect on profitability. Design/methodology/approach Using information from the top 30 airlines worldwide, in particular human and structural capital proxies, a linear model is regressed. Test of hypotheses were performed towards the identification of the influence emerged from variables, such as region, capital ownership and control and strategic alliances, on intellectual capital drivers and profitability. Findings Turnover is driven by human and structural capital factors, namely: employee expenses and benefits; size of board of directors; intangible assets; codeshare agreements; and passenger traffic. Airlines profitability does not depend on region, capital ownership and control or strategic alliance in which the company is integrated. Research limitations/implications In spite of the limitations, we underline the range of time under analysis and the sample size. However, the current approach can be replicated over time and based in other rankings, structured on different metrics and approaches. Practical implications The empirical results provide both an understanding of how independent variables positively affect the performance of airlines and offer some explanation as to the relationship between key characteristics of firms and profitability. Originality/value The research adds value to the current literature by exploring the effects of new intellectual capital drivers on profitability of airlines firms. Focused on a sector that strongly contributes to improve the networking between nations, it provides a new and updated overview.

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Abstract.Intangibles are, at a knowledgebased economy, the most important resources, driving companies towards systematic and sometimes unexpected returns. This paper follows a positivist approach and aims to investigate the association between the degree of intangibility, value of firms and their profitability. Based on the 500 largest European companies, rated by Financial Times, the most relevant insights emerge from the association between firms' knowledge intensity level and its degree of profit ability. These insights consolidate the evidences that immaterial resources act as drivers of future benefits and are embodied on firms' profitability ratios.

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