Definition
A regulatory phrase used by U.S. air defense and aviation security authorities to describe an aircraft, flight, or activity that, by its behavior, origin, route, or failure to comply with required procedures, raises concern that it could pose a danger to the safety, sovereignty, or defense of North America or the United States. An aircraft judged to meet this criterion may be intercepted, diverted, denied entry, or otherwise handled under defense and security protocols.
Plain English
Behavior or circumstances that make authorities suspect an aircraft could be a danger to North America or U.S. national security, allowing them to take action such as intercepting it.
Context Anchor
Seen in aviation security, air defense, flight restriction, and emergency-control discussions.
Why Pilots Care
Triggers immediate federal actions such as interception, forced landing, or total airspace restrictions.
Grounding Statement
A lost aircraft approaching a protected area without radio contact may be treated as a possible security threat even if the pilot has no harmful intent.
Intuition Check
Do not read “threaten” as meaning the pilot definitely intends harm. In this context, a flight can “threaten” security simply because its actions create an unresolved safety or defense concern.
Example Sentence 1
Aircraft operating in an ADIZ without an active flight plan or proper transponder code may be treated as a flight that could threaten North America or national security.
Example Sentence 2
The regulation allows the FAA to close routes if continuing operations would threaten North America or national security.