This is the Super Guppy plane. The aircraft that NASA is still using today is one of the forerunners of the world's largest cargo aircraft.
The guppy is the plane NASA uses to move parts of its enormous, light weight spacecraft from California to Florida. Its first operation was in the 1960's.
Like the Belugas and modern Dreamlifters, the Pregnant Guppy is a modified version of a passenger plane with a swollen fuselage. This aircraft is derived from one of Boeing's first aircraft, the 377 Stratocruiser.
In 1962, a new aircraft solved the problem because it had the largest cargo space ever built and was six meters in diameter. The main component of the spacecraft could reach Florida in 18 hours instead of 18 days.
The plane was called the Pregnant Guppy, its name was inspired by the guppy fish. Is the first of eight Guppies to be built over the following years.