An airplane with 2 sets of wings is known as a biplane.
An airplane that has a set of 2 wings is called a biplane.
An aircraft with one set of wings is known as a 'monoplane'. The other common configurations used to be; 2 wings = Biplane and 3 wings = Triplane.
Moths have two sets of wings its just you cant see them if they were stood right in front of you because they are two small! Some moths you can see with though because they are much bigger! If you go on google images you will see the sets of wings
a monoplane is a airplnes with 1 wing. a biplane is a aircraft with 2 wings a triplane is a airplane with 3 wings.
All diptran insects have 2 sets of wings as flies , mosquitoes etc .
The dragonfly has 2 sets of wings. One set of wings does a vertical figure 8 pattern while the other set of wings does a horizontal figure 8 pattern.