Operations Past, Current and Future.- Two-stage Interval Best-Worst Method for Prioritization of Influential Factors of Airport Competitiveness.- 2-tupe DEMATEL for Complex Interrelationships Barriers Identification, Cause-Effect Analysis and Policy Implications for Sustainable Tourism Industry.- Fuzzy Best-Worst Method and Interpretive Structural Modelling for Complex System Enablers Analysis for Aviation Maintenance Safety.- Multi-Stakeholder Multi-Criteria Decision-Making Framework for Sustainability Investigation of the Processes for Sludge-to-Wealth.