The Solar Impulse 2 landed in Cairo on Wednesday for its penultimate stop as the solar-powered plane nears the end of its marathon tour around the world.
After the two-day flight from Spain, just one final leg lies between it and its final destination, Abu Dhabi, where it started its odyssey in March last year.
The aircraft landed in Spain last month, after completing the first solo transatlantic flight powered only by sunlight.
After setting off from Seville on Monday morning, the plane passed through Algerian, Tunisian, Italian and Greek airspace, and flew over the Giza Pyramids before touching down at Cairo airport at around 7:10 am.
Its support crew cheered as the plane, no heavier than a car but with the wingspan of a Boeing 747, landed, and trailed after it on bicycles.
It had finished the 3,745 kilometre journey with an average speed of 76.7 kilometres an hour, the flight organiser said in a press release.
"It was fantastic, everything worked well," pilot Andre Borschberg told the control tower, as a live stream from the cockpit was broadcast on Solar Impulse 2's Facebook page.
He emerged from the cockpit and hugged Bertrand Piccard, with whom he has taken turns flying the plane around the world.
Solar Impulse is being flown on its 35,400-kilometre trip in stages, with Piccard and his Swiss compatriot Borschberg alternating at the controls of the single-seat plane.
Picard, who had arrived early to greet the aircraft, told reporters that flying Solar Impulse 2 showed what new technologies can do.
The 58-year-old had flown the plane across the Atlantic in a 6,765 kilometre journey.
'Reality of today'
It had completed its flight from New York to Seville in 71 hours, flying through the night with the energy stored in its 17,000 photovoltaic cells.
"It's a new era for energy," he said.
"I love to fly this plane because when you are in the air for several days you have the impression to be in a film of science fiction," he said.
"You look at the sun, you look at your motors, they turn for days and for days, no fuel. And you think that's a miracle. That's magic. It is actually the reality of today. This is what we can do with these new technologies."
He said the pilot takes 20 minute naps during the long flights, as the plane inches across the sky.
Borschberg had piloted the plane in its 8,924 kilometre flight from Japan to Hawaii in 118 hours, breaking the previous record for the longest uninterrupted journey in aviation history.
"It is comfortable. But of course you need to train for that. You need to train to make some exercise in the capsule, in the cockpit, because otherwise after several days you cannot move your legs and your arms anymore," Piccard said.
Borschberg and Piccard have said they want to raise awareness of renewable energy sources and technologies with their project.
But Piccard does not expect solar powered commercial planes any time soon.
"There will not be passengers very soon in solar airplanes like ours," he said.
"But there will be passengers very soon in electric airplanes that we will charge on the ground.
"On the ground you can charge batteries and you can have short haul flights maybe 500 kilometres with 50 people flying in these planes" in a decade, he predicted.
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