COLOGNE, Germany - The German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) has presented a comprehensive analysis of future development trajectories in aviation with its DEvelopment Pathways for Aviation up to 2070 (DEPA 2070) study. The project sought to systematically evaluate the technological, economic and societal impacts of prospective aviation developments over a period of 50 years. Despite the expected growth in global air traffic, the findings show that significant reductions in carbon dioxide (CO₂) emissions are possible. In a conservative scenario, emissions per 100 passenger kilometres could be reduced by approximately 23 percent. Savings of up to 89 percent were conceivable in a progressive scenario that factored in the early use of hydrogen-based and battery-electric propulsion systems. A key component of both scenarios is the increased use of sustainable aviation fuels (SAFs). Combined with new aircraft technologies, these could usher in more climate-compatible aviation as early as 2030, DLR reports. Continue reading original article.
The Military & Aerospace Electronics take:
24 September 2025 - Central to the study are emerging propulsion and fuel technologies. Liquid hydrogen aircraft, especially for long-haul flights, are projected to play a major role in deep emissions cuts. Hybrid-electric and fully battery-electric aircraft could prove more viable for short-haul routes, business travel, and private aviation. SAFs remain critical under both conservative and progressive scenarios, particularly for existing fleets where immediate replacement is not feasible.
The study also stresses the need for extensive infrastructure upgrades. Airports and supply systems will require significant investment to handle hydrogen production and storage, SAF distribution, and large-scale electrification. DLR concludes that timely strategic decisions and coordinated industry and policy action are essential if the aviation sector is to align with global climate goals by mid-century.
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Jamie Whitney, Senior Editor
Military + Aerospace Electronics
