Danger Area

ICAO classifies special use airspace into prohibited, restricted and danger areas, distinguished by how strongly they constrain flight. A danger area is the least restrictive in legal terms: it is fundamentally an advisory that hazardous activity may occur within the defined volume during stated periods. Crucially, danger areas are often established over the high seas or international waters, where no single state has the authority to prohibit flight, so a warning is the appropriate instrument rather than a prohibition.

Because a danger area does not legally bar entry, the responsibility falls on the pilot to understand the hazard and decide accordingly, taking into account whether the area is active. The activity warned of — live weapons firing, military training, rocket launches or similar — could be lethal to an aircraft, so in practice operators treat an active danger area much as they would a restricted one. Activity times are published, and some areas are active only by notification.

Knowing whether a danger area lies on a route, and whether it is active, is part of judging where hazards apply. AeroVigil frames such airspace alongside other restrictions and conflict signals so operators can weigh them within one picture.