WASHINGTON -- Boeing CEO Jim McNerney said his company is "very close" to getting its troubled 787 Dreamliner jet back flying again.Two incidents involving batteries on 787s led the Federal Aviation Administration and regulators in other countries to ground the planes in January. Boeing is testing a redesign of the battery system."We have a high degree of confidence in the technical solution we are testing right now with the FAA," McNerney said at an aviation conference Thursday. "I think it will be sooner than later."The Chicago-based company conducted a test flight with the redesigned battery Monday. McNerney expects the tests to conclude in a few days and said the data should be conclusive enough to convince regulators to let the plane fly again.McNerney has made few public comments to date about the 787 problems. Thursday's remarks came before a friendly crowd at a U.S. Chamber of Commerce aviation summit.The 787 was just one of several topics McNerney was asked about by Thomas J. Donohue, the head of the chamber.Regarding the economy, McNerney said: "It's sort of bumping along. Very slow growth in the United States. Not fast enough to generate job growth."Boeing, however, is doing better than the overall economy because airlines worldwide are replacing older planes with new, more fuel efficient jets. Purchases by developing countries are particularly strong, he said.Boeing and European rival Airbus dominate the market for commercial aircraft, but McNerney expects to someday see strong competition from Chinese aircraft manufacturers. They have the money and technology to catch up with the two leaders, the Boeing CEO said.China also has a large enough -- and growing -- domestic market to buy the new planes, McNerney said.