Also

* Northwest Airlines Corp. the fourth-largest U.S. carrier, notified 600 mechanics that they would be laid off in July as the company grounds 30 aircraft.

* Raytheon Co., the world’s largest missile maker, said it won a Navy contract to design a warfare system to protect the newest aircraft carrier from attack by cruise missiles and other weapons.

* Barr Pharmaceuticals Inc. said it won final approval from U.S. regulators to sell a generic version of Sanofi-Aventis’ Allegra-D allergy drug, the subject of patent litigation between the two. The last of the patents on the drug expires in 2018.