Aerogami -

Aerogami is the art of folding and flying.

(English 'aerodynamics' and Japanese 'origami')

Origami -

Origami is the art of folding.

(Japanese 'ori', to fold, and 'kami', paper).

Paper airplane -

It is a toy aeroplane made out of paper. It is perhaps the most common form of aerogami, a branch of origami.

Note: These defintions were adapted from wikipedia.