Ordinary Least Squares (OLS) regression analysis is a method relating passenger traffic to air travel prices, income (GDP) levels, and other variables that have an intuitive and measured impact on air travel, while minimising the variance (randomness) of the estimates. The regression analysis allows the relationship between traffic and air travel price to be isolated and quantified while controlling for other factors that may impact on air travel, such as gross domestic product, population levels, route distance and seasonality