The only volcano that I know of that can do that in the continual US is MT. Saint Helens and that's in Washington, which I don't think it would do much harm. But there is always Yellowstone, which if it blows we have a bigger problem then delayed flights.
The only volcano that I know of that can do that in the continual US is MT. Saint Helens and that's in Washington, which I don't think it would do much harm. But there is always Yellowstone, which if it blows we have a bigger problem then delayed flights.