The Solar Impulse 2 plane was set to continue its journey in the early hours of Wednesday after spending more than three weeks grounded in Nagoya because of bad weather.

A clear run was expected for the five or six days and nights needed for the solar-powered plane to reach Kalaeloa Airport near Honolulu, the team said, renewing hope that the pioneering aircraft may yet complete its round-the-world journey this year.

"We are very excited. We are here to fly, so we are happy that finally we are there," team spokeswoman Elke Neumann said from Nagoya.