According to Official Guinness Records,
In August 2010, as part of its 1,800 hour flight test programme, a Gulfstream G650 passenger jet serial number 6001, flown by test pilots Tom Horne and Gary Freeman, reached a flight speed of Mach 0.995 in a 16-18 degree dive in Savannah, Georgia, USA and this, together with its maximum cruising speed of Mach 0.925, make the Gulfstream G650 the fastest civil business aircraft currently flying. Designed to carry eight passengers and four crewmembers, the G650 has a potential range of 7,000 nautical miles enabling it to link Dubai with New York and London with Buenos Aires.
For a complete list of 2010 records, please visit 2010 Guinness Records in United States.