What characteristic is unique to modern jet airliners?

Modern jet airliners are designed with several advanced characteristics that make them distinct in the aviation industry. One of the key features is the incorporation of engines that are efficient, powerful, and designed specifically for jet propulsion. Additionally, these aircraft commonly have swept wings which enhance aerodynamics, enabling them to achieve higher speeds and improve fuel efficiency. The use of advanced materials in construction is also critical, as it allows for stronger yet lighter structures, improving overall performance and efficiency.

These attributes combined make modern jet airliners capable of flying at higher altitudes, covering long distances, and maintaining efficiency while ensuring passenger safety and comfort. The integration of these features represents a significant evolution in aircraft design compared to earlier generations, where such advancements were either non-existent or rudimentary, setting modern jets apart in terms of technology and performance.