It was a little less than 4 from when I did this interview with Carl Dietrich of Terrafugia in 2008 to the maiden flight of the Transition in 2012. In 2008, people were skeptical about the young kids who rolled into AirVenture with their mockup…MIT grads or not, many were convinced they’d never pull it off.

This year, we saw this:

Video from AVWeb

More details to follow, but congratulations to Terrafugia for their hardwork and perservance!