1. Critically discuss the various factors that may make it difficult for MANGO Airlines to find the best globally optimal solution.

2. Investigate on how supply chains remain competitive in complex environments making reference to MANGO Airlines.

3. Analyse certain risks with the purchasing of non-strategic items by MANGO Airlines and suggest contract types which may be used when purchasing these items from the spot market.

4. Based on your analysis, provide an in-depth discussion on the importance of supply chains within the context of global markets and strategies for MANGO Airlines to enter those markets.