NSW will host an Aerotropolis 2026 summit in the middle of next year, calling for international investment proposals and ideas on how to build Badgerys Creek airport as an integrated new city that will boost the economy of western Sydney.

"This will change lives," she said, of the expected jobs boost from the aerotropolis.

Speaking an Incheon airport in Seoul, which is consistently ranked as the world's top airport, Ms Berejiklian said she wanted to model Badgerys Creek on Incheon aerotropolis, and learn from its successes and mistakes.

She will work with the federal government to consider offering tax incentives for global companies to move into the airport precinct.

"It is something innovative we can do to attract global players. I think they are interested anyway but that extra incentive would be worthwhile," she said.

Free economic zones offer special conditions for foreign investors based in the zone, typically an airport or port.

The Incheon free economic zone offers corporate tax exemptions for foreign companies and educational and medical institutions for three to five years, depending on the industry and the level of investment.

Investing $1 million in research and development gains a three-year tax exemption, but the threshold is $5 million for medical institutes or $10 million for information or creative industries.

Incheon boasts an ice skating rink, casino, golf course and business park. It is also building 50,000 homes that are five-10 kilometres from the airport terminal and not under the flight path.

Ms Berejiklian said she hoped the airport construction and formation of the aerotropolis precinct could occur at the same time, and would push for planning approvals for both.

She said a decision had not yet been made on whether rail links would open at the same time as the airport. Incheon's experience was that two rail lines to the airport were not as well used as buses, she said.

Defence, aerospace, advanced manufacturing, freight and logistics, agribusiness, health, education and tourism companies would be invited to attend the summit.

"I don't know why we can't think big in terms of the amount of industry there," she said. She ruled out a casino.

Universities may also set up research and development hubs.

Incheon airport employs 50,000 people, but many more work in companies located in its business park and live at Sky City.

Seventy-five multinational companies are located near the airport in Incheon.

Around 60 million passengers travel through Incheon airport each year, compared to 35 million annually at Sydney Airport.