In Ancient Greek, one of the final two or three syllables of a word carries an accent. Each syllable may contain one or two vocalic morae, but only one can be accented; accented morae are pronounced at a higher pitch.
US military to launch fastest-ever plane. By the time you finish reading this sentence, the Falcon HTV-2, the fastest plane ever built, could have flown 18 miles. It would get from London to Sydney in less than an hour, while withstanding temperatures of almost 2,000C, hotter than the melting point of steel.
Some experimental, rocket-powered aircraft go much faster. For example, the X-15 is powered by a rocket and holds the record for the fastest manned aircraft, at 4,520 mph. This record was reached in 1963. As of 2014, among current military aircraft, the F-15 Eagle fighter jet reaches speeds of about 1,650 mph.