Solar Impulse 2, an aircraft powered only by the sun's rays, took off from Cairo Sunday morning on what should be the last leg of its history-making flight around the world.
Solar Impulse 2's final 48-hour flight from Cairo to Abu Dhabi may take begin on Sunday at 1:00 AM Cairo time, a “provisional time” for a trip that will be the most technically challenging of the round-the-world tour, Solar Impulse announced Friday.