fyi here is the content of the monoplane article from britannica it's not an initial monoplane type of aircraft with a single pair of wings the monoplane design has been nearly universally adopted over multiplane configurations because airflow interference between adjacent wings reduces efficiency the first monoplane was constructed by the romanian inventor trajan vuia who made a flight of m feet on march louis bl riot of france built a monoplane in and flew it across the english channel two years later monoplane design proved itself conclusively during world war ii and since then the craft has completely supplanted the biplane except for special purposes compare biplane best regards