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"China could pursue more market-based economic reforms that would bolster confidence in the renminbi," said the department.

"China is one of the world's largest countries. It gives much room for the segment to grow, as internet tools will help students across the nation improve their studies," he said.

"But the US dollar remains the wildcard. If and when the greenback strengthens again, the renminbi will come under renewed pressure, reigniting capital outflows. Then we cannot rule out a further clampdown on outflows, in order to safeguard foreign exchange reserves," he said.

"China is a huge and important market for Washington so any problems experienced by Boeing would probably be felt by other key elements of the (state's) economy," said Spencer Cohen, senior economist at Seattle-based consulting firm Community Attributes Inc, in an interview.

"China keeps pace with the times, promoting balanced development of trade and facilitating international trade," Wang said.