No / The purpose of this paper is to utilize the existing theories and knowledge surrounding information systems (IS) evaluation and Green information technology (IT)/IS investments to develop a conceptual model for helping decision makers to overcome and reduce the impacts from Green IT/IS investment related to cost overruns or under-optimized budgets. The paper is discursive, based on the analysis and synthesis of literature pertaining to IS evaluation, Green IT/IS adoption and Sustainable/Green/CSR within an aviation context. Gaps in the preceding research have been identified, and a conceptual model is proposed. Additionally, further research and a methodology are suggested. The paper proposes a conceptual model that can identify factors including external factors derived from institutional theory, internal organizational factors, and a list of indirect costs associated with Green IT/IS investments for an aviation organization. As a conceptual paper, the study is limited to literature, identifying gaps, and proposing a model. The paper recommends further empirical validation of the proposed conceptual model. The conceptual model is helpful for decision makers within the aviation industry to enhance their understanding of the identification and management of indirect costs within the aviation context, which results in effective management of Green IT/IS indirect costs. The paper fills gaps in the knowledge of IS evaluation, Green IT/IS adoption/evaluation within aviation context through helping decision makers to understand, identify, and manage the associated indirect costs.