 An immediate financial analysis that compared actual costs and revenues with their budgets followed the completion of each flight, thereby instantly gauging that flight's profitability and validating the effectiveness of the firm's pricing policy.A policy of requiring aircraft commanders to pay for all operating expenses other than fuel in cash proved to be an effective method to exercise instant cost control over fees and charges incurred for products and services supplied by third parties, such as ground handling fees, technical support services and catering supplies.In addition, the principle of strict cost control was also applied to aircraft maintenance and flight operations.