Aircraft are all sized for a particular task, there is no "best" size.
it depends on the size of the airplane or the size of the monkeys ;)
It all depends on the type and size of airplane.
Depends on the airplane size and engines used.
They are supposed to be of average size.
No size it just has to be small
I was in an airplane last week, and the washroom was the size of a broom closet.
That depends. Best for what?
It may be tight, but you should fit in an airplane seat if you wear size 22 clothing.
The worlds stealthiest airplane would probably be the size of your moms pubes
It depends upon the model of the airplane. They are not all the same size.
Generally, this is a matter of individual preference. It is unlikely that one paper airplane design is the best at everything (range, speed, glide ratio, etc.). Many airplanes are claimed to be the best, but these claims are unsubstantiated.
The best wing shape for sn airplane is like a triangle because it fly straight