He’s referring to the Banshee, the alien fighter aircraft in Halo.
The basics of compositing are outlined on this page and the pages that it points to.
If I needed to create the scene that you show, I’d get a still image of a Banshee, animate its position across the screen, and turn on motion blur (and crank it way up to hide details). To have the Banshee pass behind the wall and in front of the sky, I’d duplicate the main footage layer and separate it into foreground and background pieces. I’d probably key out the blue/white of the sky to make a matte to aid in that separation.
This is a pretty basic task in After Effects, so I’m assuming that you’re very new to After Effects. I recommend that you start here
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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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