A periodontist is a dentist who specializes in the prevention, diagnosis, and treatment of periodontal disease, and in the placement of dental implants. Periodontists are also experts in the treatment of oral inflammation.
Ground speed. Ground speed is the horizontal speed of an aircraft relative to the ground. An aircraft heading vertically would have a ground speed of zero. Information displayed to passengers through the entertainment system often gives the aircraft ground speed rather than airspeed.
The F-15 speed is mach 2.5, the Mig 25 is mach 3.2. The Concorde could fly around mach 2, but it's not in use any more. its not the concord. The SR-71 black bird(mach 3 or about 2100mph)is the fastest military jet and the NASA X-43 scramjet(mach 9-10 or about 6300-7000mph) is the fastes unmanned jet. The fastest TRUE JET is the SR-71. The key word is true JET! thats even a bit of strech for the blackbird.