The use of drop-in capable alternative fuels in aircraft can support the European aviation sector to achieve its goals for sustainable development. They can be a transitional solution in the short and medium term, as their use does not require any structural changes to the aircraft powertrain. However, the production of alternative fuels is often energy-intensive, and some feedstocks are associated with harmful effects on the environment. In addition, alternative fuels are often more expensive to produce than fossil kerosene, which can make their use unattractive. Therefore, this paper analyzes the environmental and economic impacts of four types of alternative fuels compared to fossil kerosene in a well-to-wake perspective. The fuels investigated are sustainable aviation fuels produced by power-to-liquid and biomass-to-liquid pathways. Life cycle assessment and life cycle costing are used as environmental and economic assessment methods. The results of this well-to-wake analysis reveal that the use of sustainable aviation fuels can reduce the environmental impacts of aircraft operations. However, an electricity mix based on renewable energies is needed to achieve significant reductions. In addition, from an economic perspective, the use of fossil kerosene ranks best among the alternatives. A scenario analysis confirms this result and shows that the production of sustainable aviation fuels using an electricity mix based solely on renewable energy can lead to significant reductions in environmental impact, but economic competitiveness remains problematic.

Driven by concerns regarding the sustainability of aviation and the continued growth of air traffic, increasing interest is given to emerging aircraft technologies. Although new technologies, such as battery-electric propulsion systems, have the potential to minimise in-flight emissions and noise, environmental burdens are possibly shifted to other stages of the aircraft’s life cycle, and new socio-economic challenges may arise. Therefore, a life-cycle-oriented sustainability assessment is required to identify these hotspots and problem shifts and to derive recommendations for action for aircraft development at an early stage. This paper proposes a framework for the modelling and assessment of future aircraft technologies and provides an overview of the challenges and available methods and tools in this field. A structured search and screening process is used to determine which aspects of the proposed framework are already addressed in the scientific literature and in which areas research is still needed. For this purpose, a total of 66 related articles are identified and systematically analysed. Firstly, an overview of statistics of papers dealing with life-cycle-oriented analysis of conventional and emerging aircraft propulsion systems is given, classifying them according to the technologies considered, the sustainability dimensions and indicators investigated, and the assessment methods applied. Secondly, a detailed analysis of the articles is conducted to derive answers to the defined research questions. It illustrates that the assessment of environmental aspects of alternative fuels is a dominating research theme, while novel approaches that integrate socio-economic aspects and broaden the scope to battery-powered, fuel-cell-based, or hybrid-electric aircraft are emerging. It also provides insights by what extent future aviation technologies can contribute to more sustainable and energy-efficient aviation. The findings underline the need to harmonise existing methods into an integrated modelling and assessment approach that considers the specifics of upcoming technological developments in aviation.

The use of novel battery technologies in short‐haul electric aircraft can support the aviation sector in achieving its goals for a sustainable development. However, the production of the batteries is often associated with adverse environmental and socio‐economic impacts, potentially leading to burden shifting. Therefore, this paper investigates alternative technologies for lithium–sulfur all‐solid‐state batteries (LiS‐ASSBs) in terms of their contribution to the sustainable development goals (SDGs). We propose a new approach that builds on life cycle sustainability assessment and links the relevant impact categories to the related SDGs. The approach is applied to analyze four LiS‐ASSB configurations with different solid electrolytes, designed for maximum specific energy using an electrochemical model. They are compared to a lithium–sulfur battery with a liquid electrolyte as a benchmark. The results of our cradle‐to‐gate analysis reveal that the new LiS‐ASSB technologies generally have a positive contribution to SDG achievement. However, the battery configuration with the best technical characteristics is not the most promising in terms of SDG achievement. Especially variations from the technically optimal cathode thickness can improve the SDG contribution. A sensitivity analysis shows that the results are rather robust against the weighting factors within the SDG quantification method.

Using lightweight materials in aircraft structures, especially carbon fiber reinforced polymer (CFRP), can be an option for achieving aviation's ambitious emission reduction goals. However, using CFRP can be associated with adverse environmental and economic impacts, which can relativize its potential benefits. Nevertheless, the extent of the potential advantages and disadvantages of the increased use of CFRP in the entire airframe is still uncertain, as existing studies relate to specific airframe components or estimated weight savings. This article aims to close this gap by developing detailed life cycle inventories (LCIs) for aircraft with CFRP structures and analyzing the environmental and economic impacts during aircraft production and use. Furthermore, potential reinforcement effects from using sustainable aviation fuels (SAFs) in such aircraft are investigated to determine the overall environmental and economic impacts. For this purpose, three aircraft configurations with different CFRP content are modeled using the aircraft design program “Preliminary Aircraft Design and Optimization”. Afterward, detailed LCIs are developed, and life cycle assessment and environmental life cycle costing are applied. Subsequently, an analysis is conducted where SAFs replace fossil kerosene to investigate the potential for further reductions of environmental and economic impacts. The results of the analysis indicate that increasing the CFRP content in the airframe reduces environmental impacts during production and use. Despite higher production costs, more cost‐effective flight operations are possible. Additionally, there is a reinforcement effect through using SAFs in aircraft with increased CFRP content, which can further reduce climate‐damaging emissions by several magnitudes more compared to lightweight materials alone.

Legislation and market competition make it necessary to assess systems regarding their environmental, social, and economic impacts. The life cycle sustainability assessment (LCSA) approach can be used for this purpose. However, the literature shows limitations of this approach. This article focuses on the often encountered inconsistency and reduced transparency within the economic dimension due to the lack of harmonized impact assessment methods. Therefore, we propose a novel economic life cycle impact assessment (eLCIA) method called DEALA (Differentiated Economic Assessment in a Life Cycle‐Oriented Analysis), which allows economic assessments at three levels of aggregation. Overall, DEALA is based on economic principles and provides a structured approach to conduct environmental life cycle costing studies, resulting in greater transparency, comparability, and flexibility, as illustrated by an initial comparison with an existing case study. DEALA also facilitates a differentiated and detailed analysis of the results so that hotspots and improvement potentials can be identified, making DEALA a suitable economic LCIA method that should be considered in future studies. These benefits are confirmed through a LCSA of a battery supply chain. The assessment provides detailed and specific insights that can be used to design more sustainable battery supply chains.