Only the 757 delivers full-performance, 200-passenger single-aisle service under the adverse conditions of hot temperatures, high altitudes, and short runways.

As a derivative, the 757-300 complements the 757-200; it does not be a replacement. Both models are in production.The 757-300 retains the simplicity, reliability, flight deck and operating systems and 767 commonality of the 757-200.

A common type-rating enables pilots qualified to fly any 757 or 767 to fly all the others with minimal additional familiarization, saving training time and costs. The 757/767 allows crews to fly more models with a greater variety of fuselage widths, capacities, and range capabilities than any other common-rated family.

Here is the blueprint of the Boeing 777.