Air transport is considered an important part of the transportation infrastructure and it has a great impact on urbanisation as well as long‐term economic growth. Airports significantly add to local economy and facilitate a country's integration into the global economy and also provide social benefits to the society. However, together with the socioeconomic benefits, airports adversely affect to the surrounding environments, ecology and society. Some of the main concern, that is, emission from aircraft, noise while take‐off and landing of aircraft, land use, waste disposal and energy consumption, are raised with respect to airport's functioning which requires the attention of the regulatory authorities. The authorities to find the balance approach for the development of airports and to minimise the unfavourable consequences. Therefore, the efforts to be made to develop the “sustainable airports”. “Sustainable development” practises in the airports, improves the social, financial and operational benefits of the airport and also lessen the negative impacts on the environment. After understanding the concept of “Sustainability”, next challenge is to make airport sustainable. The main objective of the article is to find, how to make airport sustainable, when it is called that the airport is a “sustainable airport”. After reviewing the relevant literatures, it may be concluded that “sustainable airports” can be developed by incorporating the sustainability concept in to the airport planning and then taking care of the airport sustainability issues and barriers and airport sustainability components, that is, policy making, commerce, social responsibility, environmental and service quality.

Examining the interrelationships between critical success factors (CSFs) is of importance for the successful development of PPP airports. Many studies are available for the identification of CSFs for infrastructure projects, but very limited research have been conducted so far on investigating the interrelationships between the CSFs of PPP airports. The study is based on the institutional theory, which considers the exploration of the relationships between different institutional factors. The results show that Process Characteristics have comparatively more impact on Public Characteristics and, similarly, Cooperative Environment has more impact on Process Characteristics. However, Process Characteristics have a less significant impact on Private Characteristics. The study also revealed that to achieve high-quality services and the protection of public interest under a PPP mechanism, proper government supervision is required. Moreover, customers’ satisfaction and their opinion are also responsible for the achievement of high-quality services and better value for money.

Sustainable ocean tourism is required to establish a balance between the environmental, economic, social and cultural aspects of ocean tourism development. Sustainable ocean tourism also contributes to local and national economies, enhancing the quality of social life and protecting the ecology. Sustainable ocean tourism expands the positive contribution of tourism to biodiversity conservation and poverty reduction and aims to attain the common goals of sustainable developments for ocean tourism. Sustainable ocean tourism is possible due to the roles of regulators and private and government institutions. Government policies, regulations and guidelines play vital roles towards achieving the sustainability of ocean tourism. However, the role of institutions also cannot be ignored, which provide support in the innovation of technologies and the implementation of policies. The paper targets to investigate the roles of regulations, policies and institutions in the sustainability of ocean tourism. A primary online survey on the perception of tourism experts was conducted for this study using Google Forms. The tourism experts were invited from all over the world to participate in the survey. The study received a total of 33 responses, out of which only 30 valid responses were considered. Using the Tobit regression model, the study found that, while regulations in India relative to foreign countries significantly boost the sustainability of ocean tourism, government policies and public institutions in India relative to foreign countries remain insignificant in predicting the sustainability of ocean tourism. Therefore, government policies and public institutions in India need to be revised and reformulated to make them important drivers of the sustainability of ocean tourism.

A public–private partnership (PPP) upgrades airport services, infrastructures, space, and ground handling systems. The participation of private entities could provide significant sustainability‐related issues since they typically have a profit‐making mindset. Private entities mainly focus on maximising their profits, but public entities are more concerned about attaining social objectives. The differences in their approaches lead to sustainability issues in a PPP airport project. However, studies on the impact of PPP on sustainability are very scarce and limited to other infrastructure sectors like health, education, and so forth. To examine the impact of PPP on Mumbai and Delhi International Airport's sustainability, this study used partial least squares structural equation modelling. The direct impact of private ownership, investment distribution, risk sharing, regulatory intervention, stakeholder engagement, and reputation and credibility on environmental, economic, and social sustainability was examined. The study revealed that PPP improved Mumbai and Delhi's airports' economic sustainability but have a smaller impact on social and environmental sustainability. Existing airports lag in social and environmental sustainability. To achieve social, environmental, and economic sustainability, the government must directly formulate and implement programmes. Regulators regulate JV activities and encourage social and environmental sustainability. Policymakers are likely to benefit most from building a favourable legal framework, commercial viability, and solid economic policies for effective private participation in PPP airports. The study focuses on institutional aspects. It will also help understand the mechanism's impact and how constructions and indicators are managed in PPP airport development.