Press Association: The world’s first commercial aircraft to be powered partly by biofuel flew into controversy as environmental campaigners denounced the inaugural flight as a publicity stunt. The Virgin Atlantic Boeing 747 flew from London Heathrow to Amsterdam, with one of the four main tanks carrying 80% standard jet fuel and a 20% mix of coconut and babassu oil. Virgin Atlantic President Sir Richard Branson said the passenger-less test flight was a "historic" step towards using …