What are reasonable rules for a paper airplane contest?

Reasonable rules for a paper airplane contest could include specifications for the size and weight of the paper used, such as a standard sheet of printer paper (8.5 x 11 inches). Contestants should be allowed to fold their airplanes in any manner but must not use additional materials like tape or glue. The planes could be judged based on distance flown, flight duration, and accuracy in hitting a target. Lastly, all flights should be conducted in a designated area to ensure safety and fairness.