Greens leader Bob Brown pursued the issue in Parliament yesterday, asking whether the Government had considered the airport master plan's proposal to turn Canberra into ''a second Sydney airport''.

Senator Brown asked if the Government would ''guarantee the people of Canberra and adjacent areas a good night's sleep by ensuring there will be a curfew at Canberra Airport from 11pm to 6am, as there is in Sydney and, indeed, in Essendon and Adelaide''.

Communications Minister Stephen Conroy, representing Transport Minister Anthony Albanese, said the Government had no current plans to change the existing noise-abatement zones surrounding the airport.

''The Government recognises concerns about the negative effects of aircraft noise and its impacts on everyday life ... '' Senator Conroy said.

''I would note that with current traffic and noise levels the Government believes there is not sufficient evidence to support calls for a curfew being imposed at Canberra Airport.''

The Government received the airport master plan on Tuesday.

It has at least 50 business days to consider it.

That would take a decision beyond the ACT election on October 18.

A spokeswoman for Mr Albanese said last night it was not an easy count to the 50 days because the relevant legislation allowed the clock to be stopped to allow for the provision of more information.

''So, the process has only started on Tuesday,'' she said.

''It will be considered by the department and, if necessary, by Airservices Australia and the Civil Aviation Safety Authority and a recommendation will be made to the minister.''

ACT Greens candidate for Molonglo Shane Rattenbury was disappointed by the Government's response.

''The precedent exists to take action,'' he said.

He added Coolangatta to Senator Brown's list of airports with curfews.

''A curfew will mean that residents across North Canberra and Gungahlin can sleep easy knowing that they will not have planes flying overhead at night,'' he said.