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The world’s largest aircraft takes off in California
The plane, called Roc, is built by Stratolaunch started by late Microsoft co-founder Paul Allen
It has a wingspan the length of an American football field and is powered by six engines
The plane is designed to drop rockets weighing up to 225 tonnes at an altitude of 35,000 ft
The test flight in California saw the plane reach a maximum speed of 305 km/h and altitude of 17,000 ft
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