The solar-power only aircraft landed in Seville, in southern Spain at 0540 GMT. It's arrival ended a 71-hour, 8-minute flight that began at John F. Kennedy International Airport in New York on Monday.
According to the Solar Impulse team, the aircraft piloted by Bertrand Piccard had flown 6,765 kilometers (4,204 miles) at a maximum height of 8,534 meters (28,000 feet) and average speed of 95 kph (59 mph).
In a tweet from the air before he landed his experimental aircraft, Piccard said "We want to represent the new world, the world of clean techs ... because the future is clean and it starts now."
Piccard's co-pilot, who he calls his "solar brother," André Borschberg, joined the mission engineers at the Mission Control Center in Monaco during the first half of the flight to help plan and follow the flight as closely as possible.
Then he had to race off to Seville, Spain to get the ground crew operations underway, preparing for Piccard’s landing. Michèle Piccard, Bertrand’s partner, also passed by the Mission Control Center for two days during the flight to watch the flight from up close and support Bertrand.
In a tweet of his own, Borschberg called the landing in Spain "incredible" and said it was the "work of a fantastic team."
With its crossing of both the Pacific and Atlantic this year, Solar Impulse 2 now has 90 percent of its history-making, round-the-world flight behind it.
"What lies ahead for the remaining 10 percent? That's still a mystery, the Solar Impulse team said in a blog post Thursday morning.
"What we know is that we’ll be staying a few days in Seville – not sure about the organization of a public day yet, we’ll keep you posted – and then fly to Egypt or Greece," the post said.
"In another three flights or so we’ll be landing in the summer heat of Abu Dhabi. We’re really beginning to feel like success is at our fingertips," the team added.
The flight began in Abu Dhabi in the United Arab Emirates in March 2015.
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