(Pardon my ASCII.)

The ISO-Standard* Paper Airplane

  1. Fold the paper in half the short way:

    +--------+--------+
    |        :        |
    |        :        |
    |        :        |
    |        :        |
    |        :        |
    +--------+--------+
    

  2. Unfold it again, and fold the corners in so they meet over the crease:

           _-+-_
         _/  |  \_
       _/    :    \_
     _/_ _ _ | _ _ _\_
    /        :        |
    |        :        |
    +--------+--------+
    

  3. Fold it down the center again, with the corners inside.

           _-+
         _/  :
       _/    |
     _/      :
    /        |
    |        :
    +--------+
    

  4. Fold the two wings over the outside so they're even with the center fold.

        /+
       / :
      /  |
     /   :
    /  __|
    |_/  :
    +----+
    

  5. Unfold the wings so they stay perpendicular to the rest of the plane. Optional: Add a paperclip to the nose for balance.

*Not really.


The Slow Glider
AKA The Plane with a Penis

  1. Fold the paper in half the long way:

    +-----------------+
    |                 |
    |                 |
    |- - - - - - - - -|
    |                 |
    |                 |
    +-----------------+
    

  2. Unfold it again, and fold the corners in so they meet over the crease:

    +-----------+_
    |           | \_
    |               \_
    |- - - - - -+ - -_>
    |              _/ 
    |           |_/   
    +-----------+
    

  3. Fold the paper in half the short way, with the folded corners inside. The point made by the folded corners should now be touching the opposite end of the paper.

    +-----+-+
    |  _/   :
    | /     |
    |<      :
    | \_    |
    |   \_  :
    +-----+-+
    

  4. Fold the corners in so they touch over the middle of the bit you folded over in step 3.

    +--+_
    |  | \_
    | /|   \
    |< + - ->
    | \|  _/
    |  |_/
    +--+
    

  5. Fold the point of the bit you folded over in step 3 so it's on top of the corners you folded in step 4.

    +--+_
    |  | \_
    |  |\  \
    |  |-> ->
    |  |/ _/
    |  |_/
    +--+
    

  6. Fold the paper over the long way. Everything you made in steps 3-4 should be on the outside.

    +--+_
    |  | \_
    |  |\  \
    +--+-+--+
    

  7. Fold the two wings over the outside so they're even with the center fold. You'll be folding 6 layers at once at this point, so you'll have to press hard to get a good crease.
    At this point, ASCII art only serves to make things more confusing.

  8. Unfold the wings again so they're perpendicular. You know the drill.

Disclaimer: I am not responsible for any damage or destruction done to you, your property, your neighbor's property, your great aunt Hilda's property, or the city of Los Angeles due to paper cuts, eye-poking, global thermonuclear war, communist mutants from space, etc. These paper airplanes are not intended for use in atomic energy, nuclear weapons, or trans-oceanic air transport. Adult supervision is recommended.