Today, in 1957, the Antonov Design Bureau marked a milestone with the maiden flight of the Antonov An-10 Ukraina.

However, the American "flying fortresses" were provided with four engines with success, just as Soviet long-range bombers and many passenger turboprop airliners in the second half of the 20th century.

In some countries, turboprop aircraft are commonplace. However, in the US, they seem to be far less common these days. Sure, there are a handful of US carriers out there operating turboprops.