Redefining the 757 replacement: Requirement for the 225/5000 Sector, Part 3.

By Bjorn Fehrm

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04 March 2015, c. Leeham Co: In the first and second part of the article series around the need for a more capable solution for 180-240 seats and 5000 nautical miles, which we have labeled the 225/5000 Sector, we went through the derivatives we have analyzed as competitors to Airbus A321LR and showed why none of them are effective as a Boeing solution.

We also looked at the wetted area and weight for our common single and dual aisle aircraft. These parameters are the principal components that determine an aircraft's efficiency given a certain engine efficiency. We also developed the market picture, outlining a substantial market by the time of entry into service of a clean sheet design by 2025, given that certain market requirements could be fulfilled.

We will now project different solutions to the requirements, thereby utilizing the preliminary design part of our proprietary aircraft model. We will look at three different cabin configurations in four different size classes between 180 to 240 seats and calculate size and weights and the resulting efficiency of the different variants. Against the key data for these different aircraft and their operational efficiency we will be able to postulate what will be the next move from Boeing and Airbus in this segment.


The findings in this our third article include:

  • Aircraft capacity and size for 12 different possible aircraft, named NAS6, NLT6 and NLT7 each in the variants 180, 200, 220 and 240 passengers.
  • With this collection of characteristics it will be possible to compare the efficiency and costs for the different sizes and to see how competitive a wider dual aisle aircraft will be in this segment compared to a single aisle.
  • In a subsequent article will be compare the operational characteristics of these aircraft thereby also covering the increased revenue potential with a dual aisle aircraft compared to a single aisle.

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