Boeing's third quarter net profits have slipped to $375m from $713m in the same period a year ago.
The earnings for the world's biggest commercial jet maker amounted to 46 cents per share excluding once-off charges, in line with Wall Street forecasts.
Revenues for the July-September quarter were $12.7 billion, down from $13.7 billion a year earlier.
The company said a poor performance at its commercial plane operations - hit by the downturn in the airline industry - was partially offset by higher revenues at both its military aircraft and missile systems and its space and communications operations.
However, as difficulties continue in the commercial market, Boeing has reduced its 2003 revenue outlook to $50 billion from $52 billion and cut jet deliveries. Its full year 2002 revenue outlook remains unchanged at around $54 billion.
