BUSINESS DIGEST
US Airways Unions Fail To Agree on Concessions US Airways and its unions negotiated throughout the week on concessions by workers, but labor leaders said they were dissastisfied. David N. Siegel, left, the chief executive, is seeking to cut $950 million in annual labor costs for a revamping plan. The airline must submit that plan to the federal government by June 28, the deadline to apply for $1 billion loan guarantees. [Page C2.]