Sydney is counting on a 20-year airport masterplan to handle the expected doubling of passengers to 74 million by 2023, making it unnecessary to build a second airport.

The masterplan involves the integration of domestic and international terminals as well as surrounding airport roads.

In 2012, the country's premier gateway handled 37 million passengers. While the 2033 projection is twice the current volume, it is lower than previous estimates of 79 million air travelers by 2029.

The draft plan, scheduled for release on Wednesday, assumes no changes to runways and curfew or flight cap.

Sydney Airport Chief Executive Kerrie Mather said the gateway does not expect to reach full capacity until 2045, while currently, only 63 per cent of its landing and take-off slots are being used.

"While we support the identification by government of a site for a second Sydney airport, our planning shows that we'll be able to meet demand well beyond 2033," Ms Mather said.

She added that should the time come for the construction of a second Sydney airport, the current operator has a first right of refusal to develop and operate the next gateway.

Ms Mather also said the airport would continue to push for new and more affordable public transport that now accounts for 17 per cent of all trips to the airport. In anticipation of that, the operator of the Sydney Airport would build a new bus and parking facility adjacent to Terminal 3, which would be widened to accommodate A380 jet.

Sydney Airport will place the draft masterplan on public exhibition until end of August to give stakeholders and the public a chance to give their feedback and comments and then submit the plan to the federal Transportation Ministry in December.

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