Pilots unemployed by the shutdown of Frontier...

Pilots unemployed by the shutdown of Frontier Airlines approved a plan that would guarantee jobs at Continental Airlines to those who drop claims against Frontier . . . Ralston Purina Co. has completed the previously announced sale of Purina Mills Inc., its U.S. animal feed subsidiary, to BP Nutrition for $545 million. BP Nutrition is a unit of British Petroleum . . . Graphic Scanning Corp. announced a definitive agreement and firm offers for the sale of about 50% of its cellular telephone properties for an aggregate price of about $150 million . . . Monsanto announced the sale of its 81-year-old artificial vanilla business to Rhone-Poulenc Inc. of France for undisclosed terms.