Kadar se posredovanje podatkov o posameznih letih, ki je del postopka koordinacije, izvaja po telefonu, je to glavna naloga podpore v enotah kontrole letenja, zlasti v centrih območne kontrole letenja (ACC).
Where it is carried out by telephone, the passing of data on individual flights as part of the coordination process is a major support task at ATC units, particularly at Area Control Centres (ACC)s.