For now, the two speediest purpose-built private planes in service rocket at over 700 mph.
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The fastest commercial airliner still in service today is the 50-year-old Boeing 747, which can reach speeds of up to Mach 0.92, or 706 mph at sea level.
Meanwhile, the Boeing 787 Dreamliner is the world's fastest twin-engine widebody jet and can journey at Mach 0.90, or 690 mph.
Some of the fastest aircraft in the sky, however, are purpose-built private jets.
Here are some of the fastest private jets in the world — with one actually exceeding Mach 1 during a test flight.
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Dassault Falcon 7X/8X: Mach 0.90 (690 mph)
The tri-engine Dassault Falcon 8X is the successor to the Falcon 7X with a longer range, better engines, and new avionics. Both can reach up to Mach 0.90, or about 690 mph at sea level.
The G280 and G400 siblings have a maximum operating speed of Mach 0.85 and 0.90, respectively — making the latter also one of the world's fastest private jets.
Dassault Falcon 10X: Mach 0.925 (710 mph)
A competitor to both Bombardier and Gulfstream, the French-made Dassault Falcon 10X twin-engine plane also can reach speeds up to Mach 0.925.
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But, it is still under development and is not expected to hit the market until 2025.
Gulfstream G700: Mach 0.935 (717 mph)
Gulfstream recently increased the speed of its flagship G700 plane to 0.935 Mach from 0.925 Mach, making it the company's fastest business plane.
G700 launch customer Qatar Airways Executive — the airline's private charter arm dedicated to flying its most elite customers — unveiled its first Q700 business jet at the Paris Air Show in June.
Cessna Citation X+: Mach 0.935 (717 mph)
With the G700's recent speed increase, it now matches that of the Cessna Citation X+ — the American-built aircraft that previously held the title of the world's fastest private jet in service.
The Citation X+ is the upgraded version of the original Citation X, which entered the market in 1996. The "rocket in the sky" has been owned by the ultra-rich.
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Only 29 Citation X+s were delivered between 2014 and 2018 when production of the type ceased completely, FlightGlobal reported.
Bombardier Global 8000: Mach 0.94 (721 mph)
The upcoming $78 million Bombardier Global 8000 private jet is poised to become the world's new fastest civil aircraft since the Concord when it enters service in 2025, boasting a top speed of Mach 0.94, or 721 mph.
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