Flying paper airplanes has never been this fun. PowerUp Toys latest product lets you add a new element of interactivity to the old-fashioned paper airplane by attaching a battery-powered propeller and rudder, which can be controlled using an iPhone app via Bluetooth. The PowerUp 3.0 Smartphone Controlled Paper Airplane Kit, currently being funded via a Kickstarter campaign, is due to hit the market in May for $50.