Boeing's fleet of 8 corporate jets spent some 4,500 hours in the sky flying company executives last year, data shows

• Boeing executives regularly use the company's eight private planes for business and personal travel.
• The fleet's 1,800 flights last year amounted to about $14 million in fuel and 22,500 tons of CO2.
• Boeing says its CEO is "required to use company aircraft for all business and personal travel for security reasons."

Boeing's top executives regularly crisscross the globe on the manufacturer's fleet of private planes, hopping between company offices and assembly lines, visiting international airshows and conferences, and sometimes jet-setting for personal use.