Delta Air Lines Inc. is planning an unspecified number of job cuts among its 10,000 management and salaried employees in a move to boost productivity. The reductions will affect support roles such as human resources and communications, not front-line workers on planes, spokeswoman Ashley Black said Friday in a telephone interview. The moves may come in locations worldwide, including Delta's headquarters in Atlanta, said Black, who wouldn't elaborate on specifics of the dismissals.