More than a hundred people have paid deposits of $10,000 each for the Transition, which will be capable of 70 miles (110 kilometers) per hour on the road and 100 mph in the sky when it finally comes to market sometime within the next three years. Dietrich is refining details on the third-generation prototype of his $279,000 vehicle before attempting certification by both the FAA, which regulates planes, and the National Highway Traffic Safety Administration, which oversees cars.