Definition
A unified national framework in which civilian aircraft and military aircraft share the same airspace, navigation aids, air traffic control services, and operating rules under common federal oversight, rather than each operating in separate, parallel systems.
Plain English
One single air traffic system used by both civilian and military flights, run together under the same set of rules and the same controllers, instead of two separate systems running side by side.
Context Anchor
Seen in the history of the FAA, especially in the Federal Aviation Act of 1958, which assigned responsibility for a coordinated air navigation system serving both civil and military aviation.
Derivation
‘Civil’ comes from the Latin civilis, meaning ‘relating to citizens,’ and refers here to non-military aviation — airlines, general aviation, and private flying. ‘Military’ refers to armed-forces aviation. Joining them as a ‘civil-military system’ signals one combined system serving both, which is the structural choice the U.S. made in 1958.
Why Pilots Care
It explains why a student pilot in a Cessna talks to the same controllers and follows the same airspace rules as an Air Force fighter or a Navy transport. The integrated system is why mid-air conflicts between civil and military traffic are managed routinely rather than through ad-hoc coordination between two separate agencies.
Intuition Check
Do not read “civil” here as meaning polite or well-behaved. In this aviation context, “civil” means non-military flying, such as private, business, and airline operations.
Example Sentence 1
The Federal Aviation Act of 1958 established a single civil-military system of air navigation under the new Federal Aviation Agency.
Example Sentence 2
Pilots training under the civil-military system of air navigation learn procedures that apply equally to civilian and military traffic sharing the national airspace.