The team hopes to attempt that flight sometime in 2015.
The round-the-world aircraft is already being designed and one of the biggest changes will be to the facilities offered for the pilot.
"Our challenge now, having a sustainable airplane, is to develop a sustainable pilot," said Borschberg. "We're constructing a second airplane in Switzerland, which will be completely different from this perspective. Different cockpit, different instruments, different support for the pilot enabling him to fly many days and many nights. So that's a very important step. That's the first airplane that has an almost unlimited endurance."
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