They use the same scale as WACs, but omit some useful information such as airspace restrictions.

In addition to areas completely off limits to civil aviation, a variety of other airspace restrictions exist in the United States.

Talks are underway to persuade the Chinese military to relax its airspace restriction in view of worsening air traffic congestion at the airport.

Are there any Royal flights on today, or any other airspace restrictions?

First, airspace restrictions of any meaningful size will have dramatic impact on arrival and departure patterns at Westchester's airport, and possibly other airports in the region.

But I can say that we've never encountered yet a case where we've needed to go someplace and we haven't been able to do so because of airspace restriction.

Despite Turkish and Ukrainian aid, the firefighting efforts were complicated by the ongoing conflict and airspace restrictions.

For the same reason, it was only tested at night, during which time airspace restrictions were put in place to prevent helicopters getting a view of the cauldron.

It will also give airlines and other operators advance notice of military airspace restrictions, so they can plan more efficient routes around areas closed to civilian traffic.

In addition to the weather, pilots and organizers must also consider local airspace restrictions.