The RAF's VIP Voyager aircraft achieved a "historic first" as it flew the Prince of Wales and Duchess of Cornwall to Jordan using sustainable aviation fuel (SAF).
Chief of the Air Staff, Air Chief Marshal Sir Mike Wigston, tweeted photos of a fuel tanker and the aircraft, writing: "The way we power our aircraft will be a big part of how @RoyalAirForce achieves #NetZero."
It comes after a Royal Air Force test pilot made history with the world's first-ever flight on 100% synthetic fuel.
SAFs are created from household waste products like paper, packaging and food scraps and other sustainable feedstocks such as cooking oil and non-palm waste oils from animals.
According to the International Air Transport Association (IATA), SAFs can cut carbon emissions by up to 80%.
Prince Charles and the Duchess landed in Jordan for a four-day tour of the country on Tuesday.
They started the trip by visiting Jordan's ruling monarch King Abdullah II and his wife Queen Rania and praised Jordan's efforts in welcoming millions of refugees from the region over the decades.
Watch: Royal Air Force test pilot makes history with the world's first-ever flight on 100% synthetic fuel.