This document provides an overview of forecasting in the aviation industry. It defines forecasting as predicting future demand based on past data to aid planning, analysis, and control. The document outlines several forecasting methods, including causal, trend analysis, and judgmental. Causal forecasts use statistical relationships between variables, trend analysis extrapolates past trends, and judgmental forecasts rely on expert opinions. The document emphasizes that forecasting is important for strategic planning, budgeting, marketing, production, and comparing actual performance to predictions.