#7 Mikoyan-Gurevich MiG-25 Foxbat
This is without a doubt one of the fastest planes to ever enter operational service in the military. This aircraft was first used in 1970, but is still used in places like Russia and Algeria today. The plane costs $18 million, goes 2190 mph and can fly around the world in less than 11.5 hours.
#6 SR-71 Blackbird
The X-15 is currently the fastest manned plane ever. This was a joint operation between NASA and the US Air Force to be used as an experimental plane. It cost a whopping $1.5 billion, and it can reach a top speed of 4520 mph. It can get around the world in under 8 hours.
#4 Boeing X-51
This plane is currently in development and should be ready for use in 2020. This is a pilotless plane designed as an extremely fast strike weapon. It will cost almost $8 million to create and will reach a top speed of 3400 mph, meaning it can get around the planet in 5.5 hours.
#3 X43A Scramjet
The Scramjet was originally developed after World War II, and finally, technology has advanced enough to make it viable. This is being developed by NASA to test hypersonic flight capabilities. The plane is planned to be able to reach 7500 mph and could fly around the world in just under 3.5 hours.