ABSTRACT
Detailed rules of air traffic services and ATFM services co-operation have been not precisely settled yet. Thus it is not determined when the information of anticipated airport capacity change should be passed to ATFM unit. On the one hand it should be done as fast as possible - so as to preserve much time to analyse and provide control process, leading to unloading traffic congestion. On the other hand early prognosis is subject to relatively big error, and decisions undertaken on its basis may be not optimal. In both cases, mistakes may lead to decrease of the level of aircraft safety.
