Boeing Co. and partners in the Airbus Industrie consortium will announce today that they are abandoning a joint study on building what was to be the world's largest commercial jet, a source close to negotiations said.

The companies have scheduled a joint announcement for about 9 a.m. EDT on the fate of the study, Boeing officials said Sunday.

Boeing and the four members of the European consortium, including France's Aerospatiale, British Aerospace, CASA of Spain and Germany's Deutsche Aerospace, have been working together since January, 1993, to study the possibility of jointly developing a double-decker aircraft with room for as many as 800 passengers.