Solar-powered planes? That's pure science fiction; here's a quote from John W. Campbell's 1930 novel The Black Star Passes:
"Dad, I believe that you have been trying to develop a successful solar engine. One that could be placed in the wings of a plane to generate power from the light falling on that surface..."
(Read more about Campbell's solar-powered airplane)
Amazingly, the solar-powered plane Solar Impulse has completed a crossing of the Mediterranean as well as (most recently) a transcontinental flight.
(Solar Impulse)
"It was perhaps the most beautiful flight of my life, I have dreamed since I was a child of flying without using fuel," said pilot Bertrand Piccard, who has already circumnavigated the world by balloon.
The single-seat aircraft is fitted with 12,000 solar cells across its immense wings and but only weighs just as much as the average family car, according to organizers.
The plane is the first of its kind to fly both during the night and day as the solar panels charge the batteries for night flying.
Orb Nomad Zero-Emission Electric Aircraft
'That explains how it was so easy for me to remain motionless in midair or to perch on a flagpole in imitation of a giant bird, even in the windy city of Chicago.' RH Romans, 1929.
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Prairie Madness - And Space Sickness
'Space-sickness is one of the most unpleasant sensations that a human being can experience. Not all are subject to it...'
'Old People Began to Cross The Continent In Their Own Cars'
'It was a relief to enter one of the comfortable autos, whisper a direction down the tube, and just know that you would be taken to your destination in the quickest, safest, and cheapest manner.'
Starfall Manufacturing Drugs In Space
'The vast spinning sphere of Factory in the Sky loomed above and ahead of us, gleaming white against the unfathomable jet depths of surrounding space.'
The Solar Oberth Slingshot
'And if it doesn’t work,' inquired Lazarus, 'what does that make us? Sunspots?'
'If Anyone Is Watching Earth...'
'Our study of your race has convinced us that you are not fitted to leave your planet in the present state of your civilization.'