> It's the first clean sheet airliner to be flown in any category, electric or not, uh, in the US in in the last 18 years.

Uh, what about the Bombardier C-series (A220)?

Wikipedia says “It was initially developed by Bombardier Aviation with the program launched on 13 July 2008 and had two years in-service as the Bombardier CSeries.”

Hence 18 years.