This paper provides a comprehensive economic analysis of scheduling decisions in an airline network. Although it is widely believed that the growth of hub-and-spoke networks has raised fight frequencies, the only analysis of this question is contained in a recent paper by Berechman and Shy...

We analyze a dynamic multi-pollutant problem where abatement costs of several pollutants are not separable. The pollutants can be either technological substitutes or complements. Environmental damage is induced by the stock of accumulated pollution. We find that optimal emission paths are...