Lockheed Martin Corp (LMT.N) said it expects to close its $9 billion acquisition of Sikorsky Aircraft from United Technologies Corp (UTX.) on Friday, now that it has received final regulatory approval from China. “With this final regulatory approval, we are one step closer to completing this historic acquisition,” said Lockheed Chief Executive Marillyn Hewson. United Tech told a Goldman Sachs investors’ conference earlier on Tuesday that the Chinese approval had been received, and the deal should close by the end of the week.