It was a single-engined biplane that was widely used for airmail services in the United States in the 1920s and 1930s, especially by airlines that later became part of United Airlines.
It was used a lot to deliver mail in the 1920s and 1930s.
It was used a lot to deliver mail in the 1920s and 1930s.
Simplifica la oración: It was a single-engined biplane that was widely used for airmail services in the United States in the 1920s and 1930s, especially by airlines that later became part of United Airlines. Producción: