For more than 20 years, the 757, along with the 767, which was developed during the same period, introduced many technological advances in aviation. The 757 was the first airplane to use a new wing design and high-bypass-ratio engines that helped create one of the most fuel-efficient, clean and quiet airplanes -- even by today's standards. The twinjet consumes 43 percent less fuel per seat than the 727 tri-jet it was designed to replace. The 757 was also the first Boeing airplane designed using a computer-aided design program and the the first Boeing airplane to use Kevlar composite materials in the manufacturing process. The 757 and the 767 pioneered the concept of commonality. These airplanes were the first to share a common flight deck and common type-rating, which permit flight crews trained on the 757 to also fly the 767.