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Commercial aviation continues to grow but few passenger or cargo journeys begin or end at airports. “Terminal” and “last” mile costs can place considerable drag on interregional trade in goods and services, attenuating growth and prosperity. The aerotropolis model provides a holistic framework for understanding – and addressing – trade costs. The central tenets of the aerotropolis model are outlined and extended by considering the decision to establish a new business facility. Implications are drawn for planning a competitive aerotropolis as the global economy enters a new era.

This paper aims to examine the planning policy and legal framework governing the creation and operation of urban agriculture in Sydney, Australia’s global city. All levels of urban agriculture are considered – from domestic and small community gardens to large agribusiness – as all make an important contribution to agricultural production in an urban context.

Using the Australian State of New South Wales and its capital Sydney, as a focus, the study examines the recent trend of the recognition and re-establishment of agriculture as a desired land use in cities. Three examples are selected for closer scrutiny – Horsley Park Urban Agriculture Precinct, located in the Western Sydney Parklands; City of Sydney’s City Farm, located in the inner suburb of St Peters; and the Western Sydney Aerotropolis Agribusiness Precinct, located at a new airport on the fringe of Sydney.

As more city-dwellers embrace urban food production and as city authorities seek to encourage and facilitate farming activities, it is clear that regulatory structures which allow it to happen should be incorporated into urban planning legislation at (in the Australian context) state government level. If cities want to encourage urban agriculture, planning legislation needs to be part of the broader legal framework for enabling it to germinate and thrive.

This paper explores the emergence of two new types of urban agriculture: first, the multi-functional, small-scale urban farming operation, situated conceptually between a community garden and a full-scale commercial agricultural enterprise, and located spatially in the midst of built-up urban form; and second, the intensive, high tech export-oriented model exemplified by the Aerotropolis Agribusiness Precinct.

Adaptive slicing is a key step in three-dimensional (3D) printing as it is closely related to the building time and the surface quality. This study aims to develop a novel adaptive slicing method based on ameliorative area ratio and accurate cusp height for 3D printing using stereolithography (STL) models.

The proposed method consists of two stages. In the first stage, the STL model is sliced with constant layer thickness, where an improved algorithm for generating active triangular patches, the list is developed to preprocess the model faster. In the second stage, the model is first divided into several blocks according to the number of contours, then an axis-aligned bounding box-based contour matching algorithm and a polygons intersection algorithm are given to compare the geometric information between several successive layers, which will determine whether these layers can be merged to one.

Several benchmarks are applied to verify this new method. Developed method has also been compared with the uniform slicing method and two existing adaptive slicing methods to demonstrate its effectiveness in slicing.

Compared with other methods, the method leads to fewer layers whilst keeping the geometric error within a given threshold. It demonstrates that the proposed slicing method can reach a trade-off between the building time and the surface quality.

Airports and urban developments in their vicinity constitute a highly specialized type of agglomeration based on air connectivity that epitomizes the importance of mobility in the modern service economy. However, in a frictionless world of backyard capitalism and perfect competition, such agglomeration of civil aviation services would not have been necessary. Thus, concepts such as imperfect markets, path dependence, and cumulative causation may be alternatively used to explain the spatial aspects of airport developments. Focusing on “second-nature” concentration, the “new geographical economics” (NGE) literature offers a potential theoretical framework that organizes these concepts into a coherent economic framework. This chapter aims to highlight the unique relevance of the NGE approach in developing an economics-based understanding of the spatial distribution of airports. Drawing from the existing NGE knowledge-base, this conceptual chapter explains that the NGE approach can be adopted as a micro-foundation to show how the spatial aspects of airport development, including core-periphery dynamics of regional disparity and parity, can emerge from economic mechanisms. The chapter concludes with potential implications for airport economics and regional policy, along with the discussion of some of the main critiques of the theory.

Airport economics literature has recently included the supply of concession services among the factors that might affect airport pricing. In particular, there is only little empirical analysis on whether: (i) the supply of airport concession services can stimulate the demand for travel (two-side complementarity) and (ii) the demand for airport concession services is independent of traveling activities (welfare neutrality). In this chapter, we survey papers that have addressed two-side complementarity and welfare neutrality in airport concessions. Our goal is to discuss the different assumptions that have shaped the models and to collect evidences, facts and empirical findings that may support analytical hypotheses. We argue that the notions of two-side complementarity and welfare neutrality might be interrelated – especially when airports invest in concessions in the area accessible to non-passengers. Welfare gains should be assessed on a case by case basis, depending on the type of airport in terms of ownership, size (and the relative mass of connecting passengers compared to origin–destination passengers), and the source of concession revenues. Our arguments might be particularly relevant to policy makers who need to understand (i) whether the supply of concessions reduces or increases the benefits of airport (aviation) price regulation and (ii) whether the effective control of market power may require the regulation of the prices of both the businesses.

This chapter examines the torsions and blind spots that structure the contemporary debate on the politics and policy of aviation. It also generates different scenarios for the future of air travel, which can help to unblock the current impasse about the perceived costs and benefits of aviation and its attendant infrastructural needs.

This chapter characterises and evaluates the competing frames that organise the contested realities of air transport. By mapping out the current fault lines of aviation politics and policy, the chapter is also able to delineate four main scenarios regarding the future of aviation, which we name the ‘post-carbon’, ‘high-modernist’, ‘market regulation’ and ‘demand management’ projections respectively.

The chapter problematises and criticises the existing literature, policy reports and stakeholder briefings that inform the contemporary standoff in UK aviation policy. It uses the definition of sustainable development as a heuristic device to map and identify the fault lines structuring contemporary debates on aviation futures. It then builds upon this analysis to delimit four different scenarios for the future of flying.

The chapter analyses the contested realities of aviation politics. It re-affirms the political nature of such divisions, which in turn structure the rival understandings of aviation. The analysis suggests that the identified fault lines are constantly reiterated by competing appeals to ambiguous and contradictory evidence-bases or policy frames. Ultimately, the chapter claims that any significant reframing of aviation policy and politics rests on the outcome of political negotiations and persuasion. But it also depends on the broader views of citizens and stakeholders about the future challenges facing society, as well as the way in which governments and affected agents put in place and coordinate the multiple arenas in which a dialogue over the future of aviation can be held. Aviation futures cannot be reduced to the narrow confines of the technical merits or claims surrounding the feasibility of policy instruments.