UAL stock plunged $16.87 1/2 to $140 a share on the New York Stock Exchange, extending Monday's $6.12 1/2-a-share drop, amid speculation that another lender has backed out of the $4 billion buyout of the airline company and may force UAL employees to seek an extension of their Aug. 9 financing deadline.

Marriott completed the sale of 50 Fairfield Inns -- its entry in the economy lodging field -- to the Fairfield Inn by Marriott L.P. for $235.5 million. Marriott will manage the inns and is the general partner.

GE tentatively won rights to build communications satellites for Inmarsat, the London-based consortium that provides communications links to ships at sea.

General Imaging Corp., a Bethesda-based computer services company that specializes in graphics systems, plans to go public. The company, which filed with the SEC for an initial public offering of 2 million common shares, had 1989 revenue of $1.7 million.

Japan's leading economic indicators for May remained well above the benchmark of 50, suggesting steady growth for its economy.

Whirlpool said it and Matsushita formed a joint venture under which their subsidiaries will operate Matsushita Floor Care Co. to produce vacuum cleaners for U.S. and export markets.

Apple Computer, in an apparent acknowledgment that its portable Macintosh is unwieldy, has acquired technology from Outbound Systems of Colorado. The deal allows Outbound to continue to make a Macintosh-like laptop without infringing on Apple's technology.