Traditionally airports managed all their commercial activities directly. However, in the past 30 years, third-party operators specialising in different commercial activity areas have emerged to replace the traditional practise. (a) Describe the 4 types of Management Models that exist in the current airport business environment. (b) One of the terminal retail success factors is the terminal design and unit location. If you were to head the Commercial Services Division, explain what would be your strategy with regards to 'terminal design and unit location' in order to ensure that the retail activities in your terminal are successful? (c) Car parking is a significant source of revenue for airports. Describe the factors that are driving the demand for car parking?