“…The relevant identified criteria are i) 'operational criticality' which consist of spare part essentiality and aircraft criticality, ii) 'technical characteristics' which consists of unscheduled demand, reliability issues, regional climate, scheduled demand, and scrap rate, and iii) 'supply characteristics' which consists of lead time, aircraft route, number of suppliers, specificity, and capability of repair. It is noteworthy to emphasise that in the aviation industry, both 'operational criticality' and 'technical characteristics' are suggested to be the most important criteria due to the stringent regulation imposed to ensure passenger safety (Vieira and Loures, 2016), while 'supply characteristics' is considered to be less important and moderated by the collaborative strategies among the aviation partners, which lead to an incresed certainty in the supply continuity (Kilpi et al, 2009). The developed AHP model enabled a practical and relevant multi-criteria classification of aircraft spare part thanks to its ability to i) aggregate both qualitative and quantitative criteria (Stoll et al, 2015), ii) structure and cluster all factors in hierarchical manner (Saaty, 2008;Saaty, 1990), iii) enable different weight in each criterion to be considered, iv) provide a transparent (Molenaers et al, 2012) and user friendly decisionmaking framework (Roda et al, 2014) and v) integrate the decision diagram logic to solve the specific aircraft spare part essentiality classification.…”