**3. Methodology for estimating air transport economic impact**

In literature as regards the air transport interaction with economy, there are many empirical analyses and ex-post assessments that analyse the sector's socioeconomic impact with different methodologies, with no unique approach to determine the interdependence of the two industries. Ref. [11] provides a guidance to estimate the economic effects of air transport, typically relying on the following approaches: the assessment of costs and benefits and the impact analysis methods (multipliers) [11].
