Number 6: XB-70 Valkyrie.
The XB-70 Valkyrie was a unique aircraft with six engines which together could accelerate the 240,000 kilogram aircraft to a velocity of mach 3. This speed resulted in the frame of the aircraft being heated up to as much as 330°C on some areas. The extreme speed was needed for two reasons: 1: To accelerate away from Soviet interceptors and 2: To be able to escape the blast of the nuclear bombs that it was capable of dropping. The big size (weight) was needed to carry the fuel needed for the 6,900 kilometer flight into the Soviet Union and escape without refueling and to house the 14 nuclear bombs that it was capable of carrying. The aircraft had its first flight in 1964 and is now retired, only two were built.
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