ALSO. . .

Boeing Co., based in Seattle, and CSA Czech Airlines announced a joint venture to acquire a minority interest in Aero Vodochody, the Czech Republic’s largest aircraft maker. . . . Lantana, Fla.-based American Media Inc. said a drop in sales at its Enquirer and Star tabloids after Princess Diana’s death could hurt its results in the fiscal third quarter. . . . Raytheon Co. Chairman Dennis Picard has told investors that he will name a successor early next year and will step down as chief executive late in 1998. . . . A joint program to combat telemarketing fraud was announced by U.S. and Canadian officials, who said such schemes cost citizens of the two nations as much as $40 billion a year. . . . Tiffany & Co. said its board approved a stock buyback program of as much as $100 million over the next three years. Shares rose $1.63 to close at $38.63 on the NYSE.