paper airplanes glide while most real airplanes have a source of propulsion also in a paper air plane you fold, it in a real airplane you weld it together
they both fly and/or glide
A kite is a toy that is kept in flight by the wind not far from the earth's surface. An airplane is a a motorized means of long distance transportation that has motors that make it possible to stay in flight at high altitudes.
The difference is surely that an arrowhead has one reflex internal angle where a kite does not.
the shape
horsefly bird ladybug butterfly fly dragonfly bee frisbee blimp airplane balloon paper airplane hot air balloon kite
the shape
You can hang off a hang glider but you can only fly a kite.
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to keep the kite secure and steady
They are both 4 sided quadrilaterals but a kite has no parallel sides whereas a parallelogram has opposite parallel sides
The dimensions of each one are going to have some bearing on the answer.
the kite