Sitting in economy class with your knees jammed up to the seat in front of you, fighting for armrest territory with your elbows as weapons, you may have found yourself wishing that your flight would somehow just be over with faster. That’s the future NASA is working on now, with a goal for a “low boom” supersonic jet that could carry travelers to any city in the world in six hours or less. NASA has forked over $20 million to a team from Lockheed Martin in a preliminary design contract to demonstrate a “low boom” aircraft. The agency says it conducted feasibility studies in its efforts to better understand what sound levels are acceptable across the country, and then asked industry teams to submit design concepts for a piloted test aircraft.