During the first five decades of commercial aviation, aircraft design changed dramatically. However, that hasn’t been the case over the last 50 years. Despite major developments in materials, the basic shape of commercial aircraft has remained relatively the same since the 1960s.
A new generation of supersonic aircraft could dramatically change commercial flight. While the basic technology has been around for decades, it's been plagued by noise issues. Due to sonic booms, supersonic jetliners are unable to fly over land.