Arabs fooled by video of "amazing new Iranian airplane"

Firas Press links to a YouTube video that claims to show an Iranian airplane being launched from underwater:

Western intelligence sources said that Iran's air industry has succeeded in manufacturing a fighter plane that takes off directly from under the sea. Those sources considered this a serious technological development that demonstrates the new capabilities of the Iranian army and Revolutionary Guard forces that support them.

One minor problem: it is fake.

The video is a few years old, and it is simply a video of an F-15 superimposed on top of a video of a missile launch from a submarine.