Apparently Airbus wasn’t the first to come up with the idea of making a transparent airplane, Pontiac nailed it first. It was the first full-size transparent car ever built.
In 1939, General Motors built a see-through Pontiac Deluxe Six sedan to be used as the centerpiece of its display at the New York World’s Fair that year. Designed in conjunction with Rohm and Haas, the company that developed Plexiglas, all of the metal bodywork of the car was replaced with the then high-tech clear plastic.
Source: Fox News