According to Official Guinness Records,
On 19 March 2008, a Boeing B-1B Lancer from 9th Bomb Squadron at Dyess Air Force Base, USA became the first aircraft to fly at supersonic speed using a synthetic fuel in a flight over the White Sands Missile Range airspace in Texas and New Mexico. The fuel, a 50/50 blend of synthetic and petroleum gases, derived from natural gases, is being tested as part of a United States Air Force programme to help the environment and reduce reliance on imported fuels.
For a complete list of 2008 records, please visit 2008 Guinness Records in United States.