Table 3.

Variables defining the metapopulation model with one class of individuals in the degree-block approximation

Variable	Definition
k	Degree of a subpopulation, i.e. number of airline connections to other subpopulations
V, Vk	Total number of subpopulations, number of subpopulations with degree k
Nk	Population size of subpopulations with degree k
wkk ' = w0(kk')θ	Number of passengers flying from a subpopulation with degree k to a subpopulation with degree k’
w0	Mobility scale
dkk ' = wkk '/Nk	Diffusion rate of passengers flying from a subpopulation with degree to a subpopulation with degree k’