[Yo-Yo]

The period that elapsed between no aircraft and jet aircraft was about three decades.

Counterpoint: In 1969, the largest commercial aircraft ever built was flown for the first time.

45 years later, the Boeing 747 is still being built.

[2ndDivisionVet]

The SSTs and Concordes caused sonic booms, as I’m sure you know, which was a no-go politically over land. A family friend worked on the North American SST in the 60’s, so I’m a little familiar with the plane. What’s the answer?