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By 2020, China will have more than 500 airports, and more than 5,000 general aviation aircraft will be in service, according to the Civil Aviation Administration of China.

But, she cautioned, despite Macao's stunning economic growth since then, there's still a long way to go to ensure sustainable development.

By 2030, it is expected to become the world's largest economy. It will also have greater influence, and even responsibility, for the health of the world economy.

But the two sides are far apart on a number of issues, and talks took a "turn for the worse" on Sunday, UAW Vice-President Terry Ditteswrote in a letter to local leaders,as the union and the Detroit automakerclashed over wages, signingbonuses, job security, pensions,skilled trades and transfer rights.Talks did resume on Tuesday.

But the National Association of Realtors, a Chicago-based trade organization said there isn't enough supply to meet demand.