U.S. airplane-maker Boeing trimmed its projected industrywide demand for airplanes over the next 20 years, but said it expects deliveries to be stable excluding the Russian market.

Boeing projects airlines worldwide will need 41,170 new airplanes over 20 years with half of the deliveries for replacement aircraft, and with single-aisle aircraft accounting for about 75% of planes.

Boeing's new market outlook, released on Sunday ahead of the Farnborough Airshow, is down from its previous rolling 20-year-forecast of 43,610 deliveries.