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By Bjorn Fehrm

July 21, 2025, © Leeham News: Our series about “What’s the next new aircraft” was introduced last week, where we look at what potential new aircraft could be introduced over the following decades, and what technologies these would use.

In Part 2 of the five-part series, we introduce some basics around aircraft efficiency and examine what areas these 13 new aircraft aim to improve to enhance their efficiency.

In the following Parts, we will look into these aircraft in more detail and write about how challenging it will be to develop and mature the needed technologies.

Figure 1. The 13 new aircraft concepts that we study. Source: Leeham Co.