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Boeing Co. will actively market McDonnell Douglas commercial airplanes and let demand decide whether they survive the companies’ merger, Boeing chief Phil Condit said during a tour of the Long Beach Douglas Aircraft facilities. “The customer will choose which products they like and we’ll continue to build them as long as they buy them,” Condit said. . . . Los Angeles-based Arden Group Inc. reported net income for the second quarter of $2.2 million, or $2.07 per share, compared with $895,000, or 81 cents, a year ago. . . . Ontario-based Kaiser Ventures Inc. reported second-quarter net income of $604,000, or 6 cents per share, compared with $294,000, or 3 cents, a year ago. . . . Van Camp Seafood Co. said it changed its name to Chicken of the Sea, the brand name of its tuna products, after its purchase by Thailand’s Tri-Union Seafoods. Tri-Union Seafoods, a group led by Thai Union Frozen Products, paid $92 million in cash and a $5-million note for the seafood company. The sale was part of Van Camp’s Chapter 11 U.S. Bankruptcy Court filing. . . . Los Angeles-based ZERO Corp. said it signed an agreement to purchase the assets of EG&G; Birtcher Inc. of El Monte from EG&G; Inc. for undisclosed terms.