an easy way to make a plane, first grab a 11x8 piece of paper.
Step 1: Step One
Fold it like so... then down again so it looks like a house... then fold the top triangle down.
Step 2: Step Two
Then fold it in so that the bulk is on the inside... then unfold everything, then get a pair of scissors and cut on the dotted line.
Step 3: Final Step
Once you've cut the dotted line fold the flaps you've created from doing so up. Then fold the the center inward and fold the wings down. then back up, fold the far edges of the wings, and your ready to fly.