The PowerUp 3.0 ($30+, preorder on kickstarter) is a small kit which you embed into a standard fold up paper airplane, at which point it turns into a full remote controlled aircraft, which you fly with your smartphone.
PowerUp 3.0 turns your self-made paper airplane into a smartphone-controlled flying machine.
You can get 10 minutes of flight from a single USB charge, a range of 180 feet via Bluetooth, compatible with both iOS and Android.