Airplane or aircraft is humanity’s greatest achievement. Imagine being able to fly without support from nature. Since the early 20th century till today, flight has become the most important part of human civilization, and the most advanced way of terrestrial traveling. However, there are restrictions on the kinds of aircraft and sizes of these aircrafts that could fly. But there do exist aircraft that can fly irrespective of their sizes. They defy gravity and this video has them all!