Surprises kept on coming. On the 4th day of the research, they were still in the industrial district north of the city, but in a smaller factory. Instead of another core of industrial intelligence, the robot units found two personal flying cars in a closed warehouse in the factory. Two flying cars! What on earth was a flying car? Apparently, it was a car that could fly. But it had four wheels too, and looked just a like regular car. What was different about it was that the design was aerodynamically optimized, meaning the body of the car was sleeker, and the driver's seat was placed in a teardrop-shaped cabin. In addition, the car had a flat chassis as well as two triangle strakes extended from both sides of the car, along with a t-shaped vertical stabilizer that had movable flaps which could provide stability whilst flying.