Definition
A wide-area data and message network used within the FAA and broader aviation system to exchange aeronautical information — including flight plans, NOTAMs, weather data, and inter-facility coordination messages — between air traffic facilities and other aviation users.
Plain English
A behind-the-scenes computer network that aviation facilities use to send each other flight plans, weather updates, NOTAMs, and other operational messages.
Context Anchor
Seen in FAA acronym and NOTAM-contraction lists, especially where aviation information is being sent or received through an official electronic system.
Derivation
‘Telecommunications’ comes from the Greek tele- meaning ‘at a distance’ and the Latin communicare meaning ‘to share.’ So a telecommunications network is simply a system for sharing information across distances — in this case, electronically, between aviation facilities.
Why Pilots Care
A pilot usually does not operate the ETN directly, but information that reaches pilots may have moved through it. Knowing the term helps a pilot understand that the item refers to an official electronic communication path, not a cockpit instrument or aircraft system.
Intuition Check
Do not read ETN as a piece of equipment in the airplane. In this context, it is the electronic network that carries aviation messages between systems.
Example Sentence 1
When the pilot filed the flight plan, it was distributed to the appropriate facilities through the ETN.
Example Sentence 2
Flight service used the ETN to send an updated weather advisory directly to the aircraft.