The research aims at examining the barriers to the use of sustainable building materials in the construction of buildings despite the environmental awareness of the designers in the field of building construction. In order to achieve the research objective a scientific methodology consists of two phases was followed, the first phase included a theoretical study to identify the reasons that prevent the use of green building materials in building construction, while the second phase included a practical study to collect the needed data and information related to research subject. The practical study included personal interviews and open questionnaire with experienced engineers in the field of building design and conducting a closed questionnaire to achieve the research objective. The results showed that the gap between the environmental awareness of the designers in the field of building construction and the realistic application is due to many reasons which were classified into two categories: administrative reasons and technical reasons.

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While helicopter-based Aerial Taxi Services (ATS) are nothing new, Urban Air Mobility gains traction with the vast amount of new eVTOL concepts announced in the recent past. Dubai has the strategy to make the ATS an integral part of a multimodal mobility with the aspiration to not limit the service to the financially affluent. By conducting an integral approach to define the entire ecosystem and requirements to setup the Aerial Taxi Service, the authors found out that an implementation of a financially viable eVTOL based ATS needs more than just the exchange of legacy helicopters. From the use-case definition across requirements for a dedicated eVTOL infrastructure (vertistructure) and the aircraft’s integration into the airspace, the aircraft is situated within a series of interacting trade-offs. Only by identifying and solving bottlenecks in the overall operation a promising ATS concept can be defined.

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