Secret Smithsonian adventures

Schoolmates Dominique, Eric, Josephine, and Ajay are excited about a field trip to the Smithsonian's National Air and Space Museum. When they get there, however, they find a very different museum than the one they were expecting. Not only is it much smaller, it's filled with balloons, blimps, and dirigibles, many of them with the same logo: BARRIS AIRSHIPS.