I honestly wonder if those measurements get adjusted over time or if the baseline of "average human height" (which I hope was factored into the calculation) was taken in the 50s? 60s? (when was commercial flight "mainstreamed"?) - as various studies show that it's been going up.
Will our ancestors (again +10cm[0]) in 100 years still mutter about reclining seats? :)
[0]: http://www.natureworldnews.com/articles/3780/20130902/averag...