Morphing planes that change shape as they fly. Solar-powered aircraft that stay aloft for months. Insect-like robots flapping gossamer wings in the cold thin air of Mars. Elevators to Earth orbit. Affordable family weekends in space hotels. Aerial warfare among squadrons of pilotless drones. Flying spycams no bigger than mosquitoes. Jumbo jets with a thousand passengers. Hypersonic flights from New York to London in under an hour. The future of flight or merely flights of fancy?