More than two decades since the Concorde supersonic airliner last took to the skies, NASA has been flying an experimental aircraft designed to replace loud sonic booms with a quieter thump equivalent to a car door slamming shut 20 feet away.

At first glance, a flyable airplane made of cardboard sounds almost like a joke – the sort of thing that collapses long before it ever leaves the ground. But YouTuber and serial tinkerer Peter Sripol built one that you could sit in, roll down a runway ...

The Federal Aviation Administration is investigating a close call between a flight school-owned Beechcraft 76 plane and a JetBlue Airways passenger jet that came within 500 feet of one another on Monday.