August 5 -- Shanghai International Airport (600009) posted a 31.36 percent year-on-year rise in first half 2011 preliminary net profit to 723 million yuan, reports yicai.com, citing a company filing.

Revenue increased 13.17 percent to 2.17 billion yuan.

The company is scheduled to release its first half report on August 25.

The company attributes the increased earnings to higher investment returns and the growth of its major business.

Separately, Shenzhen Airport (000089) had reported a 3.98 percent year-on-year fall in first half net profit to 352 million yuan due to lower gross margins.