Lockheed Martin unveils plans for quiet supersonic passenger airplane

"the noise should be audible from the ground only as a car door slamming shut"

That still sounds awful, and I imagine it isn't good for wildlife.

Also, I'm betting this would still be very expensive, but it is cool to see passenger supersonic possibly making a comeback.

On the otherhand...I wonder if this is mainly to kick Boeing while they're down.