Identify two common types of airframe design configurations.

The response highlighting monoplane and biplane configurations is accurate as these are indeed two prevalent designs in aviation history. A monoplane features a single set of wings, which is the most common configuration in modern aircraft. This design allows for more efficient aerodynamics and structural simplicity, leading to higher speeds and better fuel efficiency.

On the other hand, a biplane configuration consists of two stacked sets of wings. This design was more prevalent in the early 20th century due to the increased lift provided by the biplane's larger wing area within a limited structural weight, allowing for better short-field performance and maneuverability. While less common today, the biplane design still serves specialized purposes, especially in aerobatics and certain kinds of vintage aircraft.

The other choices, although they represent valid concepts, do not refer to different types of airframe design configurations. For instance, flying wings and canard designs are alternative configurations but are less common in everyday aviation than the monoplane and biplane models. Similarly, classifying aircraft merely by propulsion systems like jet and propeller does not directly relate to the airframe design itself. This distinction helps in understanding the variety of aircraft designs used for specific purposes and their evolution over time.