 KLM, the Royal Dutch Airline, was the first airline to operate a passenger-carrying flight using biofuel.On 23 November 2009, a Boeing 747 flew, carrying a limited number of passengers, with one of its four engines running on a 50/50 mix of biofuel and kerosene.In June 2011, a Gulfstream G450 became the first business jet to cross the Atlantic Ocean using a blend of 50/50 biofuel developed by Honeywell derived from camelina and petroleum-based jet fuel.