Boeing Commercial Airplanes has unveiled a concept vehicle for an airliner capable of crossing the Atlantic in two hours, or the Pacific in three. Boeing has joined with hypersonic specialists at the company’s Research & Technology unit to study a Mach 5 vehicle, which was revealed June 26 at the American Institute of Aeronautics and Astronautics (AIAA) Aviation 2018 conference in Atlanta. The concept is a preliminary step toward a long-range development plan.