The world's largest airplane called 'Roc' weighing nearly 2,26,800 kilograms with a 385-foot wingspan took its first ever flight in Mojave, California. Built by Stratolaunch, it's designed to launch rockets into orbit from the air. The plane is powered by six engines on a twin fuselage and is designed to fly to an altitude of 35,000 feet. The aircraft is so big its wing span is longer than a football field, or about 1.5 times that of an Airbus A380. It hit a top speed of 304 kilometers per hour (189 mph) and reached an altitude of 17,000 feet, or 5,182 meters.