The new econometric research supports the discussion from previous chapters that the sensitivity of passengers to the level of air travel prices depends significantly on the level of the market being considered and its location. The results are based on a synthesis of the new econometric results and the review of previous research. Base elasticity estimates are developed for the different levels of aggregation (route, national and supra-national level). Multiplicative estimates were then developed to adjust the elasticities to reflect specific geographical markets