(Reuters) – The U.S. government shutdown is blocking Boeing Co and Airbus from delivering aircraft to U.S. airlines, even though hundreds of furloughed workers are being recalled this week.

While recalls by the Federal Aviation Administration will allow aircraft made by Boeing to be certified, they will not allow plane makers to perform a final step, registration.

The FAA registry in Oklahoma City, Oklahoma, remains closed, the FAA said on Tuesday. The office issues registration numbers for planes and pilots, much like registration for automobiles and drivers, the agency said.

The office registers about 10,000 aircraft a month, according to the National Business Aviation Association, a trade group that said the closure also was affecting the sales of private aircraft.

Airbus said on Tuesday that the office closure prevented it from delivering jets to JetBlue Airways Corp and US Airways Group Inc.

“The airlines have been unable to get U.S. registrations for those aircraft, so unfortunately, the aircraft they need for operations remain outside of the U.S.,” an Airbus spokeswoman said.

Boeing and U.S. airlines were expected to benefit from the recall of up to 800 safety personnel from furlough. Those furloughs had threatened to halt certification of 787 Dreamliners made at the company’s South Carolina factory.

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