WASHINGTON — A divisive labor issue that had stalled negotiations on a Federal Aviation Administration reauthorization bill has been resolved, and there is now a real possibility that the long-awaited legislation could land on the president’s desk before the Jan. 31 deadline.

A conference committee had been struggling to resolve partisan disagreement over language in the Republican-controlled House version of the bill, which would make it harder for air and rail workers to unionize or decertify a union. That provision flew in the face of a decision by the National Mediation Board, and was unacceptable to Senate Democrats.

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