Boeing Co made its most bullish 20-year forecast for jetliner demand since 2011, saying on Thursday the world will need 36,770 new planes worth $5.2 trillion by 2033. The company’s annual projection is up 4.2 percent from its 2013 forecast, and it predicted beating rival Airbus Group NV in the lucrative market for twin-aisle planes as the planes are built and delivered over the next two decades.