SEATTLE – Boeing Co., the world’s second-largest airplane maker, is planning to cut about 3 percent of its work force as jetliner demand falls, hurt by the global economic downturn.

The Chicago-based company on Friday said it expects to cut about 4,500 positions from its passenger jet business, which has factories in the Seattle area. Many of the cuts will be in areas not directly associated with aircraft production.

The news comes a day after Boeing reported a 15 percent decline in passenger jet deliveries for 2008, when it faced an eight-week strike by union workers and shrinking airline demand. The lower deliveries ensured Boeing’s archrival, Europe’s Airbus, retained its rank as the world’s top plane maker.