Budget airline Scoot is replacing the built-in entertainment systems in its planes with iPads — and it's saving fuel along the way. When the airline received new planes from its parent company Singapore Airlines, it ripped out the existing systems to cut the planes' weight down by seven percent, which in turn helps reduce fuel costs. Passengers still have an entertainment option, though, as you can now rent an iPad 2 to keep occupied during the flight. The iPads come pre-loaded with 50GB worth of movies, television, games, and music, and Scoot says that the content will be refreshed every two months. For those flying economy the iPads will cost $17 for the duration of the flight, while business-class passengers will get them for free.