NASA and Lockheed Martin claim to have a prototype supersonic jet whose sonic boom sounds “like a car door slamming heard from inside”. This could open the door to commercial supersonic flight over populated areas. Well, we don’t even have commercial super-sonic flight over the oceans at the moment, which would be helpful to long-haul travelers. The article doesn’t say when this might happen, but it doesn’t sounds soon. The article does mention that there is at least one other company working on a supersonic passenger jet which “it hopes” could be “in the air” (for testing presumably?) “later this year”.