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By Bjorn Fehrm

January 28, 2022, ©. Leeham News: This is a complementary article to the Part 4. Reality Checks article. It uses data from Leeham Company’s Aircraft Performance Model to develop the relationship between OEW (Operational Empty Weight) and MZFW (Maximum Zero Fuel Weight) compared with MTOW (Maximum Take-Off Weight) for 74 airliners in the model.

The article also discusses in more detail what’s the reasons behind large weight misses for new projects and how it’s handled.