Forecasts of strong wind have put plans to fly a solar-powered plane across the length of Switzerland on hold.
The Solar Impulse team said Friday that northeasterly winds are expected to reach up to 20 miles (30 kilometers) an hour Saturday, making the flight too risky.
The group had hoped to fly the delicate single-seater with the wingspan of a Boeing 777 passenger jet from its base in Payerne to the southwestern city of Geneva.
From there it was to cross almost the entire country and land near the northeastern city of Zurich.
Pilot Andre Borschberg completed a 26-hour nonstop test flight in July to prove the plane can stay aloft overnight.
The team plans to fly the plane once round the world by 2013.