You need :-
a rectangular paper.
Step 1: Let's Begin
Half fold length wise
Open it and fold the corner's to the center crease.
Fold it downward's.
Fold it lengthwise backwards.
Open and again fold the corners to the center crease.
Fold the bottom triangle upwards.
Again fold backwards.
Fold the remaining paper on both sides to make the wings as shown.
Your air-plane is ready.
Please let me know if you liked or not.