This model is in 1/700 scale. It is based on the Space Shuttle Endeavour. It is also available from this shop with two Solid Rocket Boosters and an Super Light Weight Tank. It is part of the Space Set available from this shop.
According to Wikipedia: "The Space Shuttle orbiter was the orbital spacecraft of the Space Shuttle program operated by NASA, the space agency of the United States. The orbiter was a reusable winged "space-plane", a mixture of rockets, spacecraft, and aircraft. This space-plane could carry crews and payloads into low Earth orbit, perform on-orbit operations, then re-enter the atmosphere and land as a glider, returning its crew and any on-board payload to the Earth."