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This paper studies how airports affect economic growth in US metropolitan areas. The main finding is that airport size has a positive effect on local employment, with an elasticity of 0.04. The effect appears to be mostly due to a positive effect on services employment and to be concentrated in parts of the metropolitan area nearer the airport. To further understand how an airport affects the local economy, the effects on several other variables are estimated. Airport size is found to have positive effects on the number of firms, the population size, the rate of employment, and GDP in the local area. The magnitudes of the effects on population and employment suggest that airport expansion creates jobs for both existing residents and migrants to the area. The estimation uses a novel technique to identify the effects of airport infrastructure. It applies instruments for changes in airport size that are calculated from overall changes in air traffic in a set of categories: the airlines, the types of aircraft, or the distances flown. The technique could be adapted to study the effects of other types of infrastructure.

This paper estimates the effects of airport infrastructure on employment and the distribution of the labor force in US metropolitan areas. The analysis is based on models for the air network and for its effects on employment, which are estimated using US data. Air traffic is found to have a positive effect on the population of the local area, with an elasticity of 0.010, so airport improvements induce a reallocation of workers between regions. Air traffic is also found to have a positive effect on employment in the local area with an elasticity of 0.036 and a weakly positive effect on the employment rate in other places within 400 miles.Simulations suggest that for each job created in the local area by an airport expansion, two and a half jobs are created elsewhere in the United States due to the changes in the air network and the distribution of employment.