In Sweden, Portugal, Greece, Finland and Spain many of the airports are operated in a system of airport networks with standard airport charges, which means cross-subsidisation and often results in little transparency.
Rootsis, Portugalis, Kreekas, Soomes ja Hispaanias käitatakse paljusid lennujaamu lennujaamade liitude kaudu, mis tähendab ristsubsideerimist, ja sageli on tulemuseks vähene läbipaistvus.