financial incentive to recover embedded material and energy, Lieder and Rashid~\cite{ref9} contended that high-value, long-life industries like aviation are ideal candidates for circular economy principles. Den~Hollander et al.~\cite{ref10} created a circular product design strategies -- spanning reuse, remanufacturing, and material recycling -- that translates directly to the spare parts context. Industry Evidence supports this view: Airbus and Boeing have reported maintenance cost reductions of 30--40\% on components subject to structured remanufacturing programmes, alongside substantial emission savings.

Due to the financial benefits of recovering embedded materials and energy, Lieder and Rashid argued that high-value, long-life sectors such as aviation represent perfect opportunities for implementing circular economy approaches. Den Hollander and colleagues developed circular product design strategies that encompass reuse, remanufacturing, and material recycling, which apply directly to spare parts applications. This perspective finds support in industry data: both Airbus and Boeing have documented maintenance cost reductions of 30-40% for components included in structured remanufacturing programs, while also achieving significant emission reductions.