Some ad's at the top of the page-just ignore them - great easy tp make paper airplanes - even i managed it !
You just need a sheet of A4 paper
Fun site for kids (mainly!)http://www.paperairplanes.co.uk/planes.php
The rapier - it flies like a glider but has the elegant shape and great precision of a dart.
Paper Helicopter - when simply dropped it will stay aloft for ages and spiral down excellently.
Paper Rocket - simple to make and has some very interesting science behind it.
Paper Frisbee - This is great fun and best made out of small squares of paper maybe 15cm by 15cm (6" by 6") and thrown like a normal frisbee it will fly quite well especially indoors.
Nicks' Paper airplane - This paper airplane is a superb glider it is very well balanced indeed even when made by the most inexperienced child. It can be quickly made from a sheet of A4 paper and I really like it. I drew this page up and placed it on the internet within a day of learning to make this paper airplane.