posted on May, 13 2006 @ 08:21 PM
I know a few airports in the US have underground areas rumoured to have testing areas..What are a few jet roars among another hundred or so?
This is possible. Maybe a new jet test. Theoretically if the ground was actually shaking it would be a high performance made for a fighter aircraft
because commercial jets are supposed to be quieter nowadays. Although quiet is stretching it, I wouldn't fancy standing beside a fanjet, quieter or