Supersonic air travel has been reserved for military pilots since Concorde went out of service way back in 2003. That’s been ...

At least two flights briefly traveled faster than the speed of sound as the jet stream sped up, but there would not have been ...

Sound waves travel at approximately 750 mph at sea level, but slow down at higher altitudes. The speed of sound is called "Mach 1." Supersonic refers to speeds from Mach 1 to Mach 5 (1 to 5 times ...

We visited Boom Supersonic's hangar in Mojave, California, as the company makes preparations to break the sound barrier with its XB-1 demonstrator aircraft.

Built by Lockheed Martin in the 1960s, the SR-71 could reach speeds exceeding Mach 3 (above 2,200 mph). That's over 3 times faster than the speed of sound. The recon jets went out of service in 1998.

Actually, in 1974, it got worse. The national speed limit was lowered to 55 mph, ostensibly to save fuel and lives (it did neither). Such an agonizingly slow rate of travel proved too much to take ...

A typical value for the wind is about 12 m/s and the speed of sound in air is about 330 m/s. It is useful to be able to convert between everyday units such miles per hour (mph) to the units used ...