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This chapter presents a data envelopment analysis (DEA) based relative financial strength (RFS) indicator using accounting data that is predictive of stock market performance of public firms. Such an indicator is indispensable in the fundamental analysis of firms for stock portfolio selections. This methodology requires optimally configuring inputs and outputs for the DEA model such that the strength indicator is maximally correlated with observed stock returns. This optimized RFS indicator providing the maximum predictive strength of stock returns is determined by factors such as asset utilization, leverage, profitability, and growth rates, in addition to the well-known factor, book-to-market ratio. Computational evidence is provided using more than 800 firms covering all major sectors of the U.S. stock market. Using quarterly financial data, we employ the RFS indicator to devise portfolios that yield superior financial performance relative to using portfolios of sector-based funds.

During the 1920s, military interests in Latin America and international and diplomatic relations gave the impetus to the creation national airlines. In countries like Colombia and Brazil, the technological and commercial approaches of Germany and other Europeans nations influenced the forms airlines took. In the following decade the United States began to exert its influence which was consolidated after the Second World War. The pattern continued until the 1980s and involved strong international regulation, the predominance of publicly owned national airlines, and American technological leadership. Market liberalization then brought about a new scenario involving privatizations of national airlines across the region, intensified competition, and mergers and acquisitions that led to the formation of large carriers. Today, passenger traffic in the region is dominated by two carriers: LATAM and Avianca. Other local airlines remain, often linked to a global alliance member. Air traffic has been grown, with the prospect of further growth after economic recovery flowing the COVID-19 pandemic. Historically, commercial air traffic has adapted to the needs of its vast territory but where institutional changes have played a very important and often decisive role.

Since 2000, the value of aircraft assets imported to – and exported from – the Irish economy has increased significantly. In each case, these figures represent a marked rise over a 17-year period. This gives rise to some simple questions: what are the dynamics that give rise to a small, open economy's demand for aircraft assets on this scale? Indeed, is it merely a reflection of our island location or is there something more at play? And can we comment on the role of the air cargo industry in this demand? Ireland's growing aircraft leasing industry is internationally orientated with Ireland emerging as an important hub for this industry. A recent industry estimate noted that nine of the world's 10 largest aircraft leasing companies are located in Ireland with the number of aircraft managed in Ireland at 3,500 (or 50%) of the entire global fleet of leased aircraft. This, in part, is an important contributor to this demand for aircraft assets. The objective of this research is to examine the flow of imports and exports of aircrafts to, and through, Ireland using Eurostat's International Trade in Goods Statistics (ITGS) dataset. The authors also use the International Trade in Services series in the Balance of Payments in order to consider the value, and relative scale, of the services provided by air freight operators in order to provide some context to the role of the air cargo sector.

In spite of the extensive literature on the regulation of air transport services, until the development of the Quantitative Air Services Agreements Review (QUASAR) methodology no systematic review existed of the degree of liberalization granted through air services agreements. The chapter lays out QUASARs key features, and presents the main results its application has generated. It then elaborates on how the methodology could be further refined and extended to other segments of the air transport industry yet uncovered. Based on QUASAR, the chapter critically evaluates some commonly held beliefs about the liberalization of international passenger transport and then moves on to explore the technical feasibility of creating a liberal multilateral regime for air transport services. QUASAR has demonstrated that, although the air transport sector has experienced some liberalization over the past few years, this has been, overall, rather marginal. The skies are not truly open.