Joined wings also known as pack or bi-diamond wings contain two collections of wings joined up with mutually at the wing tips. This settings replaces an aircraft's vertical and horizontal tail planes. The idea was first copyrighted by Julian Wolkovitch in 1980s. The tandem wings can be a blend of sweepback wings in conjunction with onward swept wings. Student will be likely to conduct a critical overview of the near future era aircraft designs (Boeing, NASA, Lockheed-Martin)..