Australian startup Flirtley has developed new flying robots, all for the sake of mail-order delivery in Sydney. These drones will be dropping books, in conjunction with textbook rental service Zookal. The world's first unmanned aerial delivery technology, Flirtley's flyers will cut down the price of same-day delivery service to a fraction of what it currently costs. The robots are hexacopters; with six battery-powered rotors and a clutch that releases the goods upon delivery. Unmanned flying devices are presently illegal in the US and other parts of the world, giving Flirtley a head-start on perfecting the model before it goes global.