In the base's operations center, television screens reported that the weather had "gone red," meaning that the skies were unsafe for flying.
"If it's unsafe to fly or land, we won't.
The hospital got him a life-flight helicopter, but high winds made it unsafe to fly.
The European authorities have expressed concern that the plane, which failed a French inspection in 2007, may have been unsafe to fly.
Walker said opportunities to spot inherent dangers on the ageing plane were missed and he was satisfied, on the balance of probability, that the design modifications for the aircraft contained a "serious design flaw" that made it unsafe to fly.
The International Civil Aviation Organisation has announced that it will convene a group of experts to help it provide guidance for the industry to decide what level of ash in the atmosphere makes it unsafe to fly.
I learned later that this was not the intended ending (a technical problem made it unsafe to fly), but in that moment I wondered if Taymor hadn't also given us that shocking image – of a young man deciding to be a hero, but knowing that in reality, we can't fly.
BRUSSELS — Transport ministers from the European Union agreed on Tuesday to speed up plans to unify control over the region's airspace and to establish strict guidelines for when levels of contaminants such as volcanic ash in the atmosphere make it unsafe to fly.
Quatermass decides that they can use the remaining Quatermass II rocket like a nuclear bomb and destroy the asteroid, much to Leo's protest at the rocket being unsafe to fly.
He also argues that the shuttle's considerable risks make it unsafe to continue flying it.
