Which airliners from the 1930s met the definition of modern airliners?

The correct answer is grounded in the defining characteristics of modern airliners as seen in the aviation landscape of the 1930s. The Electra, DC-2, and 247 were all designed with significant advancements in technology and comfort that set the stage for the future of commercial aviation.

The Lockheed Electra was notable for its twin-engine configuration, which allowed for greater speed and efficiency compared to earlier airliners. Additionally, its design incorporated a more aerodynamic fuselage and improved passenger accommodations, signaling a shift towards more modern passenger air travel experiences.

The Douglas DC-2, introduced shortly thereafter, built on the innovations of its predecessors by offering increased capacity, range, and reliability. This aircraft laid the groundwork for the even more famous DC-3, which revolutionized air travel with its ability to operate on shorter runways and serve routes that were previously unreachable by commercial aircraft.

The Boeing 247 was another pioneer in the field, being one of the first all-metal, low-wing monoplanes with a fully enclosed cabin, which was a step forward for passenger comfort and safety. These features collectively allowed the 247 to enhance operational efficiency and reliability.

In summary, these aircraft from the 1930s are recognized as modern airliners because they