by 
chewkc65
ANSWERS: 2
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Transonic and supersonic are two seperate terms. Supersonic means beyond the speed of sound and transonic means "speed approximately equal to that of sound in air". http://dictionary.reference.com/search?q=transonic It is important to note that the speed of sound varies with the temperature and humidity of the air (and a few other minor variants). But it can be said that the speed of sound in fairly cold and dry air (like an airplane would travel in) is close to 750 miles/per/hour. Therefore supersonic travel is faster than the speed of sound (close to 750 mph) and transonic travel is traveling at the speed of sound. Transonic travel is almost impossible to attain if you mean to actually travel at exactly the speed of sound (transonic speed) as that speed changes constantly depending on the weather. P.S. If the temp raises so does the speed of sound. So if you meant to ask about traveling speed on land, 750 mph is somewhat slower than sound. Unless you are testing the sound barrier at near freezing temperatures and very low humidity.
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Transonic is defined (as far as I remember) as the region between Mach 0.8 and Mach 1.2. Anything below Mach 0.8 is subsonic, and anything above Mach 1.2 is supersonic.
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