Planes that never took off

The first flight took place on the 17th December 1903 and the wright brothers were the first people to fly a plane. Sincde then, many planes have been built and flown. However, there have also been a few planes that never got past the planning stage. Today, I will be bringing these planes back back to people's minds. The first one of these planes is the McDonnell Douglas MD-12.

The MD-12 was to be the first fully double decker plane ever built(a superjumbo as some may call it). It was an aircraft design study undertaken by the McDonnell Douglas company in the 1990's. It would have become a competitor to the airbus 380 and the designs for the airbus 380 were probably taken from the designs of the MD-12. It's first flight was to have taken place in late 1995 and the first MD-12's would have been delivered to airlines in 1997 as it was planned. The next plane that I will be talking about is the Boeing 2707. The Boeing 2707 was the first american supersonic aircraft to be developed. In 1958, Boeing had started to think about future supersonic aircraft designs, however, over the next few years, environmental concerns, ecinomic viability and fear ruined the project, so in 1971, the US government cut funding for the Boeing 2707 project. 

I am sorry that I did not have a picture of the Boeing 2707 as for some reason the picture did not save onto my computer properly.