Boeing 737 fuselages are delivered by train to a Boeing manufacturing site in Renton, Washington, February 26, 2014. The world's largest plane makers are soaring, fueled by historic demand for new jets that has cranked up their factories to record speeds. But booming sales of aircraft, far from being a bonanza for suppliers, are spurring brutal competition between Airbus Group NV and Boeing Co, which are demanding better deals from the companies that make billions of parts the factories need. Picture taken February 26, 2014. To match Insight BOEING-SUPPLIERS/ REUTERS/Jason Redmond (UNITED STATES - Tags: BUSINESS TRANSPORT INDUSTRIAL TPX IMAGES OF THE DAY)